Aluminium alloy

Aluminium alloys (or aluminum alloys; see spelling differences) are alloys in which aluminium (Al) is the predominant metal. The typical alloying elements are copper, magnesium, manganese, silicon, tin and zinc. There are two principal classifications, namely casting alloys and wrought alloys, both of which are further subdivided into the categories heat-treatable and non-heat-treatable. About 85% of aluminium is used for wrought products, for example rolled plate, foils and extrusions. Cast aluminium alloys yield cost-effective products due to the low melting point, although they generally have lower tensile strengths than wrought alloys. The most important cast aluminium alloy system is Al–Si, where the high levels of silicon (4.0–13%) contribute to give good casting characteristics. Aluminium alloys are widely used in engineering structures and components where light weight or corrosion resistance is required.[1]

Welded aluminium alloy bicycle frame, made in the 1990s.

Alloys composed mostly of aluminium have been very important in aerospace manufacturing since the introduction of metal-skinned aircraft. Aluminium-magnesium alloys are both lighter than other aluminium alloys and much less flammable than other alloys that contain a very high percentage of magnesium.[2]

Aluminium alloy surfaces will develop a white, protective layer of aluminium oxide if left unprotected by anodizing and/or correct painting procedures. In a wet environment, galvanic corrosion can occur when an aluminium alloy is placed in electrical contact with other metals with more positive corrosion potentials than aluminium, and an electrolyte is present that allows ion exchange. Referred to as dissimilar-metal corrosion, this process can occur as exfoliation or as intergranular corrosion. Aluminium alloys can be improperly heat treated. This causes internal element separation, and the metal then corrodes from the inside out.

Aluminium alloy compositions are registered with The Aluminum Association. Many organizations publish more specific standards for the manufacture of aluminium alloy, including the Society of Automotive Engineers standards organization, specifically its aerospace standards subgroups,[3] and ASTM International.

Engineering use and aluminum alloys properties

Aluminium alloy bicycle wheel. 1960s Bootie Folding Cycle

Aluminium alloys with a wide range of properties are used in engineering structures. Alloy systems are classified by a number system (ANSI) or by names indicating their main alloying constituents (DIN and ISO). Selecting the right alloy for a given application entails considerations of its tensile strength, density, ductility, formability, workability, weldability, and corrosion resistance, to name a few. A brief historical overview of alloys and manufacturing technologies is given in Ref.[4] Aluminium alloys are used extensively in aircraft due to their high strength-to-weight ratio. On the other hand, pure aluminium metal is much too soft for such uses, and it does not have the high tensile strength that is needed for airplanes and helicopters.

Aluminium alloys versus types of steel

Aluminium alloys typically have an elastic modulus of about 70 GPa, which is about one-third of the elastic modulus of most kinds of steel and steel alloys. Therefore, for a given load, a component or unit made of an aluminium alloy will experience a greater deformation in the elastic regime than a steel part of identical size and shape. Though there are aluminium alloys with somewhat-higher tensile strengths than the commonly used kinds of steel, simply replacing a steel part with an aluminium alloy might lead to problems.

With completely new metal products, the design choices are often governed by the choice of manufacturing technology. Extrusions are particularly important in this regard, owing to the Case with which aluminium alloys, particularly the Al–Mg–Si series, can be extruded to form complex profiles.

In general, stiffer and lighter designs can be achieved with Aluminium alloy than is feasible with steels. For instance, consider the bending of a thin-walled tube: the second moment of area is inversely related to the stress in the tube wall, i.e. stresses are lower for larger values. The second moment of area is proportional to the cube of the radius times the wall thickness, thus increasing the radius (and weight) by 26% will lead to a halving of the wall stress. For this reason, bicycle frames made of aluminium alloys make use of larger tube diameters than steel or titanium in order to yield the desired stiffness and strength. In automotive engineering, cars made of aluminium alloys employ space frames made of extruded profiles to ensure rigidity. This represents a radical change from the common approach for current steel car design, which depend on the body shells for stiffness, known as unibody design.

Aluminium alloys are widely used in automotive engines, particularly in cylinder blocks and crankcases due to the weight savings that are possible. Since aluminium alloys are susceptible to warping at elevated temperatures, the cooling system of such engines is critical. Manufacturing techniques and metallurgical advancements have also been instrumental for the successful application in automotive engines. In the 1960s, the aluminium cylinder heads of the Corvair earned a reputation for failure and stripping of threads, which is not seen in current aluminium cylinder heads.

An important structural limitation of aluminium alloys is their lower fatigue strength compared to steel. In controlled laboratory conditions, steels display a fatigue limit, which is the stress amplitude below which no failures occur – the metal does not continue to weaken with extended stress cycles. Aluminium alloys do not have this lower fatigue limit and will continue to weaken with continued stress cycles. Aluminium alloys are therefore sparsely used in parts that require high fatigue strength in the high cycle regime (more than 107 stress cycles).

Heat sensitivity considerations

Often, the metal's sensitivity to heat must also be considered. Even a relatively routine workshop procedure involving heating is complicated by the fact that aluminium, unlike steel, will melt without first glowing red. Forming operations where a blow torch is used can reverse or remove heat treating, therefore is not advised whatsoever. No visual signs reveal how the material is internally damaged. Much like welding heat treated, high strength link chain, all strength is now lost by heat of the torch. The chain is dangerous and must be discarded.

Aluminium is subject to internal stresses and strains. Sometimes years later, as is the tendency of improperly welded aluminium bicycle frames to gradually twist out of alignment from the stresses of the welding process. Thus, the aerospace industry avoids heat altogether by joining parts with rivets of like metal composition, other fasteners, or adhesives.

Stresses in overheated aluminium can be relieved by heat-treating the parts in an oven and gradually cooling it—in effect annealing the stresses. Yet these parts may still become distorted, so that heat-treating of welded bicycle frames, for instance, can result in a significant fraction becoming misaligned. If the misalignment is not too severe, the cooled parts may be bent into alignment. Of course, if the frame is properly designed for rigidity (see above), that bending will require enormous force.

Aluminium's intolerance to high temperatures has not precluded its use in rocketry; even for use in constructing combustion chambers where gases can reach 3500 K. The Agena upper stage engine used a regeneratively cooled aluminium design for some parts of the nozzle, including the thermally critical throat region; in fact the extremely high thermal conductivity of aluminium prevented the throat from reaching the melting point even under massive heat flux, resulting in a reliable, lightweight component.

Household wiring

Because of its high conductivity and relatively low price compared with copper in the 1960s, aluminium was introduced at that time for household electrical wiring in North America, even though many fixtures had not been designed to accept aluminium wire. But the new use brought some problems:

  • The greater coefficient of thermal expansion of aluminium causes the wire to expand and contract relative to the dissimilar metal screw connection, eventually loosening the connection.
  • Pure aluminium has a tendency to creep under steady sustained pressure (to a greater degree as the temperature rises), again loosening the connection.
  • Galvanic corrosion from the dissimilar metals increases the electrical resistance of the connection.

All of this resulted in overheated and loose connections, and this in turn resulted in some fires. Builders then became wary of using the wire, and many jurisdictions outlawed its use in very small sizes, in new construction. Yet newer fixtures eventually were introduced with connections designed to avoid loosening and overheating. At first they were marked "Al/Cu", but they now bear a "CO/ALR" coding.

Another way to forestall the heating problem is to crimp the short "pigtail" of copper wire. A properly done high-pressure crimp by the proper tool is tight enough to reduce any thermal expansion of the aluminium. Today, new alloys, designs, and methods are used for aluminium wiring in combination with aluminium terminations.

Alloy designations

Wrought and cast aluminium alloys use different identification systems. Wrought aluminium is identified with a four digit number which identifies the alloying elements.

Cast aluminium alloys use a four to five digit number with a decimal point. The digit in the hundreds place indicates the alloying elements, while the digit after the decimal point indicates the form (cast shape or ingot).

Temper designation

The temper designation follows the cast or wrought designation number with a dash, a letter, and potentially a one to three digit number, e.g. 6061-T6. The definitions for the tempers are:[5][6]

-F : As fabricated
-H : Strain hardened (cold worked) with or without thermal treatment

-H1 : Strain hardened without thermal treatment
-H2 : Strain hardened and partially annealed
-H3 : Strain hardened and stabilized by low temperature heating
Second digit : A second digit denotes the degree of hardness
-HX2 = 1/4 hard
-HX4 = 1/2 hard
-HX6 = 3/4 hard
-HX8 = full hard
-HX9 = extra hard

-O : Full soft (annealed)
-T : Heat treated to produce stable tempers

-T1 : Cooled from hot working and naturally aged (at room temperature)
-T2 : Cooled from hot working, cold-worked, and naturally aged
-T3 : Solution heat treated and cold worked
-T4 : Solution heat treated and naturally aged
-T5 : Cooled from hot working and artificially aged (at elevated temperature)
-T51 : Stress relieved by stretching
-T510 : No further straightening after stretching
-T511 : Minor straightening after stretching
-T52 : Stress relieved by thermal treatment
-T6 : Solution heat treated and artificially aged
-T7 : Solution heat treated and stabilized
-T8 : Solution heat treated, cold worked, and artificially aged
-T9 : Solution heat treated, artificially aged, and cold worked
-T10 : Cooled from hot working, cold-worked, and artificially aged

-W : Solution heat treated only

Note: -W is a relatively soft intermediary designation that applies after heat treat and before aging is completed. The -W condition can be extended at extremely low temperatures but not indefinitely and depending on the material will typically last no longer than 15 minutes at ambient temperatures.

Wrought alloys

The International Alloy Designation System is the most widely accepted naming scheme for wrought alloys. Each alloy is given a four-digit number, where the first digit indicates the major alloying elements, the second — if different from 0 — indicates a variation of the alloy, and the third and fourth digits identify the specific alloy in the series. For example, in alloy 3105, the number 3 indicates the alloy is in the manganese series, 1 indicates the first modification of alloy 3005, and finally 05 identifies it in the 3000 series.[7]

  • 1000 series are essentially pure aluminium with a minimum 99% aluminium content by weight and can be work hardened.
  • 2000 series are alloyed with copper, can be precipitation hardened to strengths comparable to steel. Formerly referred to as duralumin, they were once the most common aerospace alloys, but were susceptible to stress corrosion cracking and are increasingly replaced by 7000 series in new designs.
  • 3000 series are alloyed with manganese, and can be work hardened.
  • 4000 series are alloyed with silicon. Variations of aluminium-silicon alloys intended for casting (and therefore not included in 4000 series) are also known as silumin.
  • 5000 series are alloyed with magnesium, and offer superb corrosion resistance, making them suitable for marine applications. Also, 5083 alloy has the highest strength of not heat-treated alloys. Most 5000 series alloys include manganese as well.
  • 6000 series are alloyed with magnesium and silicon. They are easy to machine, are weldable, and can be precipitation hardened, but not to the high strengths that 2000 and 7000 can reach. 6061 alloy is one of the most commonly used general-purpose aluminium alloys.
  • 7000 series are alloyed with zinc, and can be precipitation hardened to the highest strengths of any aluminium alloy (ultimate tensile strength up to 700 MPa for the 7068 alloy). Most 7000 series alloys include magnesium and copper as well.
  • 8000 series are alloyed with other elements which are not covered by other series. Aluminium-lithium alloys are an example.[8]

1000 series

1000 series aluminium alloy nominal composition (% weight) and applications
AlloyAl contentsAlloying elementsUses and refs
105099.5-Drawn tube, chemical equipment
106099.6-Universal
107099.7-Thick-wall drawn tube
110099.0Cu 0.1Universal, holloware
114599.45-Sheet, plate, foil
119999.99-Foil[9]
120099.0 max(Si + Fe) 1.0 max; Cu 0.05 max; Mn 0.05 max; Zn 0.10 max; Ti 0.05 max; others 0.05 (each) .015 (total)[10]
1230 (VAD23)#Si 0.3; Fe 0.3; Cu 4.8–5.8; Mn 0.4–0.8; Mg 0.05; Zn 0.1; Ti 0.15; Li 0.9–1.4; Cd 0.1–0.25Tu-144 aircraft[11]
135099.5-Electrical conductors
137099.7-Electrical conductors
1420#92.9Mg 5.0; Li 2.0; Zr 0.1Aerospace
1421#92.9Mg 5.0; Li 2.0; Mn 0.2; Sc 0.2; Zr 0.1Aerospace[12]
1424#Si 0.08; Fe 0.1; Mn 0.1–0.25; Mg 4.7–5.2; Zn 0.4–0.7; Li 1.5–1.8; Zr 0.07–0.1; Be 0.02–0.2; Sc 0.05–0.08; Na 0.0015[11]
1430#Si 0.1; Fe 0.15; Cu 1.4–1.8; Mn 0.3–0.5; Mg 2.3–3.0; Zn 0.5–0.7; Ti 0.01–0.1; Li 1.5–1.9; Zr 0.08–0.14; Be 0.02–0.1; Sc 0.01–0.1; Na 0.003; Ce 0.2–0.4; Y 0.05–0.1[11]
1440#Si 0.02–0.1; Fe 0.03–0.15; Cu 1.2–1.9; Mn 0.05; Mg 0.6–1.1; Cr 0.05; Ti 0.02–0.1; Li 2.1–2.6; Zr 0.10–0.2; Be 0.05–0.2; Na 0.003[11]
1441#Si 0.08; Fe 0.12; Cu 1.5–1.8; Mn 0.001–0.010; Mg 0.7–1.1; Ti 0.01–0.07; Ni 0.02–0.10; Li 1.8–2.1; Zr 0.04–0.16; Be 0.02–0.20Be-103 and Be-200 hydroplanes[11]
1441K#Si 0.08; Fe 0.12; Cu 1.3–1.5; Mn 0.001–0.010; Mg 0.7–1.1; Ti 0.01–0.07; Ni 0.01–0.15; Li 1.8–2.1; Zr 0.04–0.16; Be 0.002–0.01[11]
1445#Si 0.08; Fe 0.12; Cu 1.3–1.5; Mn 0.001–0.010; Mg 0.7–1.1; Ti 0.01–0.1; Ni 0.01–0.15; Li 1.6–1.9; Zr 0.04–0.16; Be 0.002–0.01; Sc 0.005–0.001; Ag 0.05–0.15; Ca 0.005–0.04; Na 0.0015[11]
1450#Si 0.1; Fe 0.15; Cu 2.6–3.3; Mn 0.1; Mg 0.1; Cr 0.05; Zn 0.25; Ti 0.01–0.06; Li 1.8–2.3; Zr 0.08–0.14; Be 0.008–0.1; Na 0.002; Ce 0.005–0.05An-124 and An-225 aircraft[11]
1460#Si 0.1; Fe 0.03–0.15; Cu 2.6–3.3; Mg 0.05; Ti 0.01–0.05; Li 2.0–2.4; Zr 0.08–0.13; Na 0.002; Sc 0.05–0.14; B 0.0002–0.0003Tu-156 aircraft[11]
V-1461#Si 0.8; Fe 0.01–0.1; Cu 2.5–2.95; Mn 0.2–0.6; Mg 0.05–0.6; Cr 0.01–0.05; Zn 0.2–0.8; Ti 0.05; Ni 0.05–0.15; Li 1.5–1.95; Zr 0.05–0.12; Be 0.0001–0.02; Sc 0.05–0.10; Ca 0.001–0.05; Na 0.0015[11]
V-1464#Si 0.03–0.08; Fe 0.03–0.10; Cu 3.25–3.45; Mn 0.20–0.30; Mg 0.35–0.45; Ti 0.01–0.03; Li 1.55–1.70; Zr 0.08–0.10; Sc 0.08–0.10; Be 0.0003–0.02; Na 0.0005[11]
V-1469#Si 0.1; Fe 0.12; Cu 3.2–4.5; Mn 0.003–0.5; Mg 0.1–0.5; Li 1.0–1.5; Zr 0.04–0.20; Sc 0.04–0.15; Ag 0.15–0.6[11]

# Not an International Alloy Designation System name

2000 series

2000 series aluminium alloy nominal composition (% weight) and applications
AlloyAl contentsAlloying elementsUses and refs
200493.6Cu 6.0; Zr 0.4Aerospace
201193.7Cu 5.5; Bi 0.4; Pb 0.4Universal
201493.5Cu 4.4; Si 0.8; Mn 0.8; Mg 0.5Universal
201794.2Cu 4.0; Si 0.5; Mn 0.7; Mg 0.6Aerospace
202093.4Cu 4.5; Li 1.3; Mn 0.55; Cd 0.25Aerospace
202493.5Cu 4.4; Mn 0.6; Mg 1.5Universal, aerospace[13]
202994.6Cu 3.6; Mn 0.3; Mg 1.0; Ag 0.4; Zr 0.1Alclad sheet, aerospace[14]
203696.7Cu 2.6; Mn 0.25; Mg 0.45Sheet
204894.8Cu 3.3; Mn 0.4; Mg 1.5Sheet, plate
205593.5Cu 3.7; Zn 0.5; Li 1.1; Ag 0.4;Mn 0.2; Mg 0.3; Zr 0.1Aerospace extrusions,[15]
208094.0Mg 3.7; Zn 1.85; Cr 0.2; Li 0.2Aerospace
209095.0Cu 2.7; Li 2.2; Zr 0.12Aerospace
209194.3Cu 2.1; Li 2.0; Mg 1.5; Zr 0.1Aerospace, cryogenics
2094Si 0.12; Fe 0.15; Cu 4.4–5.2; Mn 0.25; Mg 0.25–0.8; Zn 0.25; Ti 0.10; Ag 0.25–0.6; Li 0.7–1.4; Zr 0.04–0.18[11]
209593.6Cu 4.2; Li 1.3; Mg 0.4; Ag 0.4; Zr 0.1Aerospace
2097Si 0.12; Fe 0.15; Cu 2.5–3.1; Mn 0.10–0.6; Mg 0.35; Zn 0.35; Ti 0.15; Li 1.2–1.8; Zr 0.08–0.15[11]
2098Si 0.12; Fe 0.15; Cu 2.3–3.8; Mn 0.35; Mg 0.25–0.8; Zn 0.35; Ti 0.10; Ag 0.25–0.6; Li 2.4–2.8; Zr 0.04–0.18[11]
209994.3Cu 2.53; Mn 0.3; Mg 0.25; Li 1.75; Zn 0.75; Zr 0.09Aerospace[16]
212493.5Cu 4.4; Mn 0.6; Mg 1.5Plate
219593.5Cu 4.0; Mn 0.5; Mg 0.45; Li 1.0; Ag 0.4; Zr 0.12aerospace,[17][18] Space Shuttle Super Lightweight external tank,[19] and the SpaceX Falcon 9[20] and Falcon 1e second stage launch vehicles.[21]
2196Si 0.12; Fe 0.15; Cu 2.5–3.3; Mn 0.35; Mg 0.25–0.8; Zn 0.35; Ti 0.10; Ag 0.25–0.6; Li 1.4–2.1; Zr 0.08–0.16[11]Extrusion
2197Si 0.10; Fe 0.10; Cu 2.5–3.1; Mn 0.10–0.50; Mg 0.25; Zn 0.05; Ti 0.12; Li 1.3–1.7; Zr 0.08–0.15[11]
2198Sheet
221892.2Cu 4.0; Mg 1.5; Fe 1.0; Si 0.9; Zn 0.25; Mn 0.2Forgings, aircraft engine cylinders[22]
221993.0Cu 6.3; Mn 0.3;Ti 0.06; V 0.1; Zr 0.18Universal, Space Shuttle Standard Weight external tank
2297Si 0.10; Fe 0.10; Cu 2.5–3.1; Mn 0.10–0.50; Mg 0.25; Zn 0.05; Ti 0.12; Li 1.1–1.7; Zr 0.08–0.15[11]
2397Si 0.10; Fe 0.10; Cu 2.5–3.1; Mn 0.10–0.50; Mg 0.25; Zn 0.05–0.15; Ti 0.12; Li 1.1–1.7; Zr 0.08–0.15[11]
2224&232493.8Cu 4.1; Mn 0.6; Mg 1.5Plate[13]
231993.0Cu 6.3; Mn 0.3; Ti 0.15; V 0.1; Zr 0.18Bar and wire
251993.0Cu 5.8; Mg 0.2; Ti 0.15; V 0.1; Zr 0.2Aerospace armor plate
252493.8Cu 4.2; Mn 0.6; Mg 1.4Plate, sheet[23]
261893.7Cu 2.3; Si 0.18; Mg 1.6; Ti 0.07; Fe 1.1; Ni 1.0Forgings

3000 series

3000 series aluminium alloy nominal composition (% weight) and applications
AlloyAl contentsAlloying elementsUses and refs
300398.6Mn 1.5; Cu 0.12Universal, sheet, rigid foil containers, signs, decorative
300497.8Mn 1.2; Mg 1Universal, beverage cans[24]
300598.5Mn 1.0; Mg 0.5Work-hardened
310299.8Mn 0.2Work-hardened[25]
3103&330398.8Mn 1.2Work-hardened
310597.8Mn 0.55; Mg 0.5Sheet
320398.8Mn 1.2Sheet, high strength foil

4000 series

4000 series aluminium alloy nominal composition (% weight) and applications
AlloyAl contentsAlloying elementsUses and refs
400698.3Si 1.0; Fe 0.65Work-hardened or aged
400796.3Si 1.4; Mn 1.2; Fe 0.7; Ni 0.3; Cr 0.1Work-hardened
401596.8Si 2.0; Mn 1.0; Mg 0.2Work-hardened
403285Si 12.2; Cu 0.9; Mg 1; Ni 0.9;Forgings
404394.8Si 5.2Rod
404785.5Si 12.0; Fe 0.8; Cu 0.3; Zn 0.2; Mn 0.15; Mg 0.1Sheet, cladding, fillers[26]
454393.7Si 6.0; Mg 0.3architectural extrusions

5000 series

5000 series aluminium alloy nominal composition (% weight) and applications
AlloyAl contentsAlloying elementsUses and refs
5005 & 565799.2Mg 0.8Sheet, plate, rod, cubesats
501099.3Mg 0.5; Mn 0.2;
501994.7Mg 5.0; Mn 0.25;
502494.5Mg 4.6; Mn 0.6; Zr 0.1; Sc 0.2Extrusions, aerospace[27]
502693.9Mg 4.5; Mn 1; Si 0.9; Fe 0.4; Cu 0.3
505098.6Mg 1.4Universal
5052 & 565297.2Mg 2.5; Cr 0.25Universal, aerospace (cubesats), marine
505694.8Mg 5.0; Mn 0.12; Cr 0.12Foil, rod, rivets
505993.5Mg 5.0; Mn 0.8; Zn 0.6; Zr 0.12rocket cryogenic tanks
508394.8Mg 4.4; Mn 0.7; Cr 0.15Universal, welding, marine
508695.4Mg 4.0; Mn 0.4; Cr 0.15Universal, welding, marine
5154 & 525496.2Mg 3.5; Cr 0.25;Universal, rivets[28]
518295.2Mg 4.5; Mn 0.35;Sheet
525297.5Mg 2.5;Sheet
535694.6Mg 5.0; Mn 0.12; Cr 0.12; Ti 0.13Rod, MIG wire
545496.4Mg 2.7; Mn 0.8; Cr 0.12Universal
545694Mg 5.1; Mn 0.8; Cr 0.12Universal
545798.7Mg 1.0; Mn 0.2; Cu 0.1Sheet, automobile trim[29]
555799.1Mg 0.6; Mn 0.2; Cu 0.1Sheet, automobile trim[30]
575495.8Mg 3.1; Mn 0.5; Cr 0.3Sheet, Rod

6000 series

6000 series aluminium alloy nominal composition (% weight) and applications
AlloyAl contentsAlloying elementsUses and refs
600598.7Si 0.8; Mg 0.5Extrusions, angles
600997.7Si 0.8; Mg 0.6; Mn 0.5; Cu 0.35Sheet
601097.3Si 1.0; Mg 0.7; Mn 0.5; Cu 0.35Sheet
601397.05Si 0.8; Mg 1.0; Mn 0.35; Cu 0.8Plate, aerospace, smartphone cases[31][32]
602297.9Si 1.1; Mg 0.6; Mn 0.05; Cu 0.05; Fe 0.3Sheet, automotive[33]
606098.9Si 0.4; Mg 0.5; Fe 0.2Heat-treatable
606197.9Si 0.6; Mg 1.0; Cu 0.25; Cr 0.2Universal, structural, aerospace (cubesats)[34]
6063 & 646g98.9Si 0.4; Mg 0.7Universal, marine, decorative
6063A98.7Si 0.4; Mg 0.7; Fe 0.2Heat-treatable
606597.1Si 0.6; Mg 1.0; Cu 0.25; Bi 1.0Heat-treatable
606695.7Si 1.4; Mg 1.1; Mn 0.8; Cu 1.0Universal
607096.8Si 1.4; Mg 0.8; Mn 0.7; Cu 0.28Extrusions
608198.1Si 0.9; Mg 0.8; Mn 0.2Heat-treatable
608297.5Si 1.0; Mg 0.85; Mn 0.65Heat-treatable
610198.9Si 0.5; Mg 0.6Extrusions
610598.6Si 0.8; Mg 0.65Heat-treatable
611396.8Si 0.8; Mg 1.0; Mn 0.35; Cu 0.8; O 0.2Aerospace
615198.2Si 0.9; Mg 0.6; Cr 0.25Forgings
616298.6Si 0.55; Mg 0.9Heat-treatable
620198.5Si 0.7; Mg 0.8Rod
620598.4Si 0.8; Mg 0.5;Mn 0.1; Cr 0.1; Zr 0.1Extrusions
626296.8Si 0.6; Mg 1.0; Cu 0.25; Cr 0.1; Bi 0.6; Pb 0.6Universal
635197.8Si 1.0; Mg 0.6;Mn 0.6Extrusions
646398.9Si 0.4; Mg 0.7Extrusions
695197.2Si 0.5; Fe 0.8; Cu 0.3; Mg 0.7; Mn 0.1; Zn 0.2Heat-treatable

7000 series

7000 series aluminium alloy nominal composition (% weight) and applications
AlloyAl contentsAlloying elementsUses and refs
700593.3Zn 4.5; Mg 1.4; Mn 0.45; Cr 0.13; Zr 0.14; Ti 0.04Extrusions
701093.3Zn 6.2; Mg 2.35; Cu 1.7; Zr 0.1;Aerospace
7022 91.1 Zn 4.7; Mg 3.1; Mn 0.2; Cu 0.7; Cr 0.2; plate, molds[35][36]
703485.7Zn 11.0; Mg 2.3; Cu 1.0Ultimate tensile strength 750 MPa[37]
703992.3Zn 4.0; Mg 3.3; Mn 0.2; Cr 0.2Aerospace armor plate
704988.1Zn 7.7; Mg 2.45; Cu 1.6; Cr 0.15Universal, aerospace
705089.0Zn 6.2; Mg 2.3; Cu 2.3; Zr 0.1Universal, aerospace
705587.2Zn 8.0; Mg 2.3; Cu 2.3; Zr 0.1Plate, extrusions, aerospace[38]
706588.5Zn 7.7; Mg 1.6; Cu 2.1; Zr 0.1Plate, aerospace[39]
706887.6Zn 7.8; Mg 2.5; Cu 2.0; Zr 0.12Aerospace, Ultimate tensile strength 710 MPa
707299.0Zn 1.0Sheet, foil
7075 & 717590.0Zn 5.6; Mg 2.5; Cu 1.6; Cr 0.23Universal, aerospace (cubesats), forgings
707991.4Zn 4.3; Mg 3.3; Cu 0.6; Mn 0.2; Cr 0.15-
708589.4Zn 7.5; Mg 1.5; Cu 1.6Thick plate, aerospace[40]
709386.7Zn 9.0; Mg 2.5; Cu 1.5; O 0.2; Zr 0.1Aerospace
711693.7Zn 4.5; Mg 1; Cu 0.8Heat-treatable
712993.2Zn 4.5; Mg 1.6; Cu 0.7-
715089.05Zn 6.4; Mg 2.35; Cu 2.2; O 0.2; Zr 0.1Aerospace
717888.1Zn 6.8; Mg 2.7; Cu 2.0; Cr 0.26Universal, aerospace
725587.5Zn 8.0; Mg 2.1; Cu 2.3; Zr 0.1Plate, aerospace[41]
747590.3Zn 5.7; Mg 2.3; Si 1.5; Cr 0.22Universal, aerospace

8000 series

8000 series aluminium alloy nominal composition (% weight) and applications
AlloyAl contentAlloying elementsUses and refs
800698.0Fe 1.5; Mn 0.5;Universal, weldable
800988.3Fe 8.6; Si 1.8; V 1.3High-temperature aerospace[42]
801198.7Fe 0.7; Si 0.6Work-hardened
801498.2Fe 1.4; Mn 0.4;universal[43]
801987.5Fe 8.3; Ge 4.0; O 0.2Aerospace
8025Si 0.05; Fe 0.06–0.25; Cu 0.20; Mg 0.05; Cr 0.18; Zn 0.50; Ti 0.005–0.02; Li 3.4–4.2; Zr 0.08–0.25[11]
803099.3Fe 0.5; Cu 0.2wire[44]
8090Si 0.20; Fe 0.30; Cu 1.0–1.6; Mn 0.10; Mg 0.6–1.3; Cr 0.10; Zn 0.25; Ti 0.10; Li 2.2–2.7; Zr 0.04–0.16[11]
8091Si 0.30; Fe 0.50; Cu 1.0–1.6; Mn 0.10; Mg 0.50–1.2; Cr 0.10; Zn 0.25; Ti 0.10; Li 2.4–2.8; Zr 0.08–0.16[11]
8093Si 0.10; Fe 0.10; Cu 1.6–2.2; Mn 0.10; Mg 0.9–1.6; Cr 0.10; Zn 0.25; Ti 0.10; Li 1.9–2.6; Zr 0.04–0.14[11]
817699.3Fe 0.6; Si 0.1electrical wire[45]

Mixed list

Wrought aluminium alloy composition limits (% weight)
Alloy Si Fe Cu Mn Mg Cr Zn V Ti Bi Ga Pb Zr Limits†† Al
EachTotal
1050[46]0.250.400.050.050.050.050.0399.5 min
10600.250.350.050.0280.030.030.050.050.0280.030.030.030.030.02899.6 min
11000.95 Si+Fe0.05–0.200.050.100.050.1599.0 min
1199[46]0.0060.0060.0060.0020.0060.0060.0050.0020.0050.00299.99 min
20140.50–1.20.73.9–5.00.40–1.20.20–0.80.100.250.150.050.15remainder
20240.500.503.8–4.90.30–0.91.2–1.80.100.250.150.050.15remainder
22190.20.305.8–6.80.20–0.400.020.100.05–0.150.02–0.100.10–0.250.050.15remainder
30030.60.70.05–0.201.0–1.50.100.050.15remainder
30040.300.70.251.0–1.50.8–1.30.250.050.15remainder
31020.400.70.100.05–0.400.300.100.050.15remainder
40414.5–6.00.800.300.050.050.100.200.050.15remainder
50050.30.70.20.20.5-1.10.10.250.050.15remainder
50520.250.400.100.102.2–2.80.15–0.350.100.050.15remainder
50830.400.400.100.40–1.04.0–4.90.05–0.250.250.150.050.15remainder
50860.400.500.100.20–0.73.5–4.50.05–0.250.250.150.050.15remainder
51540.250.400.100.103.10–3.900.15–0.350.200.200.050.15remainder
53560.250.400.100.104.50–5.500.05–0.200.100.06–0.200.050.15remainder
54540.250.400.100.50–1.02.4–3.00.05–0.200.250.200.050.15remainder
54560.250.400.100.50–1.04.7–5.50.05–0.200.250.200.050.15remainder
57540.400.400.100.502.6–3.60.300.200.150.050.15remainder
60050.6–0.90.350.100.100.40–0.60.100.100.100.050.15remainder
6005A0.50–0.90.350.300.500.40–0.70.300.200.100.050.15remainder
60600.30–0.60.10–0.300.100.100.35–0.60.050.150.100.050.15remainder
60610.40–0.80.70.15–0.400.150.8–1.20.04–0.350.250.150.050.15remainder
60630.20–0.60.350.100.100.45–0.90.100.100.100.050.15remainder
60660.9–1.80.500.7–1.20.6–1.10.8–1.40.400.250.200.050.15remainder
60701.0–1.70.500.15–0.400.40–1.00.50–1.20.100.250.150.050.15remainder
60820.7–1.30.500.100.40–1.00.60–1.20.250.200.100.050.15remainder
61050.6–1.00.350.100.100.45–0.80.100.100.100.050.15remainder
61620.40–0.80.500.200.100.7–1.10.100.250.100.050.15remainder
62620.40–0.80.70.15–0.400.150.8–1.20.04–0.140.250.150.40–0.70.40–0.70.050.15remainder
63510.7–1.30.500.100.40–0.80.40–0.80.200.200.050.15remainder
64630.20–0.60.150.200.050.45–0.90.050.050.15remainder
70050.350.400.100.20–0.701.0–1.80.06–0.204.0–5.00.01–0.060.08–0.200.050.15remainder
70220.500.500.50–1.000.10–0.402.60–3.700.10–0.304.30–5.200.200.050.15remainder
70680.120.151.60–2.400.102.20–3.000.057.30–8.300.010.05–0.150.050.15remainder
70720.7 Si+Fe0.100.100.100.8–1.30.050.15remainder
70750.400.501.2–2.00.302.1–2.90.18–0.285.1–6.10.200.050.15remainder
70790.30.400.40–0.800.10–0.302.9–3.70.10–0.253.8–4.80.100.050.15remainder
71160.150.300.50–1.10.050.8–1.44.2–5.20.050.050.030.050.15remainder
71290.150.300.50–0.90.101.3–2.00.104.2–5.20.050.050.030.050.15remainder
71780.400.501.6–2.40.302.4–3.10.18–0.286.3–7.30.200.050.15remainder
8176[45]0.03–0.150.40–1.00.100.030.050.15remainder
Alloy Si Fe Cu Mn Mg Cr Zn V Ti Bi Ga Pb Zr Limits†† Al
EachTotal
Manganese plus chromium must be between 0.12–0.50%.
††This limit applies to all elements for which no other limit is specified on a given row, because no column exists or because the column is blank.

Cast alloys

The Aluminum Association (AA) has adopted a nomenclature similar to that of wrought alloys. British Standard and DIN have different designations. In the AA system, the second two digits reveal the minimum percentage of aluminium, e.g. 150.x correspond to a minimum of 99.50% aluminium. The digit after the decimal point takes a value of 0 or 1, denoting casting and ingot respectively.[1] The main alloying elements in the AA system are as follows:[47]

  • 1xx.x series are minimum 99% aluminium
  • 2xx.x series copper
  • 3xx.x series silicon, with added copper and/or magnesium
  • 4xx.x series silicon
  • 5xx.x series magnesium
  • 6xx.x unused series
  • 7xx.x series zinc
  • 8xx.x series tin
  • 9xx.x other elements
Minimum tensile requirements for cast aluminium alloys[48]
Alloy typeTemperTensile strength (min) in ksi (MPa)Yield strength (min) in ksi (MPa)Elongation in 2 in %
ANSIUNS
201.0A02010T760.0 (414)50.0 (345)3.0
204.0A02040T445.0 (310)28.0 (193)6.0
242.0A02420O23.0 (159)N/AN/A
T6132.0 (221)20.0 (138)N/A
A242.0A12420T7529.0 (200)N/A1.0
295.0A02950T429.0 (200)13.0 (90)6.0
T632.0 (221)20.0 (138)3.0
T6236.0 (248)28.0 (193)N/A
T729.0 (200)16.0 (110)3.0
319.0A03190F23.0 (159)13.0 (90)1.5
T525.0 (172)N/AN/A
T631.0 (214)20.0 (138)1.5
328.0A03280F25.0 (172)14.0 (97)1.0
T634.0 (234)21.0 (145)1.0
355.0A03550T632.0 (221)20.0 (138)2.0
T5125.0 (172)18.0 (124)N/A
T7130.0 (207)22.0 (152)N/A
C355.0A33550T636.0 (248)25.0 (172)2.5
356.0A03560F19.0 (131)9.5 (66)2.0
T630.0 (207)20.0 (138)3.0
T731.0 (214)N/AN/A
T5123.0 (159)16.0 (110)N/A
T7125.0 (172)18.0 (124)3.0
A356.0A13560T634.0 (234)24.0 (165)3.5
T6135.0 (241)26.0 (179)1.0
443.0A04430F17.0 (117)7.0 (48)3.0
B443.0A24430F17.0 (117)6.0 (41)3.0
512.0A05120F17.0 (117)10.0 (69)N/A
514.0A05140F22.0 (152)9.0 (62)6.0
520.0A05200T442.0 (290)22.0 (152)12.0
535.0A05350F35.0 (241)18.0 (124)9.0
705.0A07050T530.0 (207)17.0 (117)5.0
707.0A07070T737.0 (255)30.0 (207)1.0
710.0A07100T532.0 (221)20.0 (138)2.0
712.0A07120T534.0 (234)25.0 (172)4.0
713.0A07130T532.0 (221)22.0 (152)3.0
771.0A07710T542.0 (290)38.0 (262)1.5
T5132.0 (221)27.0 (186)3.0
T5236.0 (248)30.0 (207)1.5
T642.0 (290)35.0 (241)5.0
T7148.0 (331)45.0 (310)5.0
850.0A08500T516.0 (110)N/A5.0
851.0A08510T517.0 (117)N/A3.0
852.0A08520T524.0 (165)18.0 (124)N/A
Only when requested by the customer

Named alloys

  • A380 Offers an excellent combination of casting, mechanical and thermal properties, exhibits excellent fluidity, pressure tightness and resistance to hot cracking. Used in the Aerospace Industry
  • Alferium an aluminium-iron alloy developed by Schneider, used for aircraft manufacture by Société pour la Construction d'Avions Métallique "Aviméta"
  • Alclad aluminium sheet formed from high-purity aluminium surface layers bonded to high strength aluminium alloy core material[49]
  • Birmabright (aluminium, magnesium) a product of The Birmetals Company, basically equivalent to 5251
  • Duralumin (copper, aluminium)
  • Hindalium (aluminium, magnesium, manganese, silicon) product of Hindustan Aluminium Corporation Ltd, made in 16ga rolled sheets for cookware
  • Pandalloy Pratt&Whitney proprietary alloy, supposedly having high strength and superior high temperature performance.
  • Magnalium
  • Magnox (magnesium, aluminium)
  • Silumin (aluminium, silicon)
  • Titanal (aluminium, zinc, magnesium, copper, zirconium) a product of Austria Metall AG. Commonly used in high performance sports products, particularly snowboards and skis.
  • Y alloy, Hiduminium, R.R. alloys: pre-war nickel-aluminium alloys, used in aerospace and engine pistons, for their ability to retain strength at elevated temperature. These are replaced nowadays by higher-performing iron-aluminium alloys like 8009 capable to operate with low creep up to 300C.

Applications

Aerospace alloys

Aluminium–Scandium

Parts of the Mig–29 are made from Al–Sc alloy.[50]

The addition of scandium to aluminium creates nanoscale Al3Sc precipitates which limit the excessive grain growth that occurs in the heat-affected zone of welded aluminium components. This has two beneficial effects: the precipitated Al3Sc forms smaller crystals than are formed in other aluminium alloys[50] and the width of precipitate-free zones that normally exist at the grain boundaries of age-hardenable aluminium alloys is reduced.[50] Scandium is also a potent grain refiner in cast aluminium alloys, and atom for atom, the most potent strengthener in aluminium, both as a result of grain refinement and precipitation strengthening.

An added benefit of scandium additions to aluminium is that the nanoscale Al3Sc precipitates that give the alloy its strength are coarsening resistant at relatively high temperatures (~350 °C). This is in contrast to typical commercial 2xxx and 6xxx alloys, which quickly lose their strength at temperatures above 250 °C due to rapid coarsening of their strengthening precipitates.[51]

The effect of Al3Sc precipitates also increase the alloy yield strength by 50–70 MPa (7.3–10.2 ksi).

In principle, aluminium alloys strengthened with additions of scandium are very similar to traditional nickel-base superalloys, in that both are strengthened by coherent, coarsening resistant precipitates with an ordered L12 structure. However, Al-Sc alloys contain a much lower volume fraction of precipitates and the inter-precipitate distance is much smaller than in their nickel-base counterparts. In both cases however, the coarsening resistant precipitates allow the alloys to retain their strength at high temperatures.[52]

The increased operating temperature of Al-Sc alloys has significant implications for energy efficient applications, particularly in the automotive industry. These alloys can provide a replacement for denser materials such as steel and titanium that are used in 250-350 °C environments, such as in or near engines. Replacement of these materials with lighter aluminium alloys leads to weight reductions which in turn leads to increased fuel efficiencies.[53]

Additions of erbium and zirconium have been shown to increase the coarsening resistance of Al-Sc alloys to ~400 °C. This is achieved by the formation of a slow-diffusing zirconium-rich shell around scandium and erbium-rich precipitate cores, forming strengthening precipitates with composition Al3(Sc,Zr,Er).[54] Additional improvements in the coarsening resistance will allow these alloys to be used at increasingly higher temperatures.

Titanium alloys, which are stronger but heavier than Al-Sc alloys, are still much more widely used.[55]

The main application of metallic scandium by weight is in aluminium-scandium alloys for minor aerospace industry components. These alloys contain between 0.1% and 0.5% (by weight) of scandium. They were used in the Russian military aircraft Mig 21 and Mig 29.[50]

Some items of sports equipment, which rely on high performance materials, have been made with scandium-aluminium alloys, including baseball bats,[56] lacrosse sticks, as well as bicycle[57] frames and components, and tent poles.

U.S. gunmaker Smith & Wesson produces revolvers with frames composed of scandium alloy and cylinders of titanium.[58]

List of aerospace aluminium alloys

The following aluminium alloys are commonly used in aircraft and other aerospace structures:[59][60]

  • 1420
  • 2004; 2014; 2017; 2020; 2024; 2080; 2090; 2091; 2095; 2219; 2224; 2324; 2519; 2524
  • 4047
  • 6013; 6061; 6063; 6113; 6951;
  • 7010; 7049; 7050; 7055; 7068; 7075; 7079; 7093; 7150; 7178; 7475;
  • 8009;

Note that the term aircraft aluminium or aerospace aluminium usually refers to 7075.[61][62]

4047 aluminium is a unique alloy used in both the aerospace and automotive applications as a cladding alloy or filler material. As filler, aluminum alloy 4047 strips can be combined to intricate applications to bond two metals.[63]

6951 is a heat treatable alloy providing additional strength to the fins while increasing sag resistance; this allows the manufacturer to reduce the gauge of the sheet and therefore reducing the weight of the formed fin. These distinctive features make aluminum alloy 6951 one of the preferred alloys for heat transfer and heat exchangers manufactured for aerospace applications.[64]

6063 aluminium alloys are heat treatable with moderately high strength, excellent corrosion resistance and good extrudability. They are regularly used as architectural and structural members.[65]

The following list of aluminium alloys are currently produced, but less widely used:

  • 2090 aluminium
  • 2124 aluminium
  • 2324 aluminium
  • 6013 aluminium
  • 7050 aluminium
  • 7055 aluminium
  • 7150 aluminium
  • 7475 aluminium

Marine alloys

These alloys are used for boat building and shipbuilding, and other marine and salt-water sensitive shore applications.[66]

4043, 5183, 6005A, 6082 also used in marine constructions and off shore applications.

Cycling alloys

These alloys are used for cycling frames and components

Automotive alloys

6111 aluminium and 2008 aluminium alloy are extensively used for external automotive body panels, with 5083 and 5754 used for inner body panels. Bonnets have been manufactured from 2036, 6016, and 6111 alloys. Truck and trailer body panels have used 5456 aluminium.

Automobile frames often use 5182 aluminium or 5754 aluminium formed sheets, 6061 or 6063 extrusions.

Wheels have been cast from A356.0 aluminium or formed 5xxx sheet. [67]

Cylinder blocks and crankcases are often cast made of aluminium alloys. The most popular aluminium alloys used for cylinder blocks are A356, 319 and to a minor extend 242.

Air and gas cylinders

6061 aluminum and 6351 aluminium [68] are widely used in breathing gas cylinders for scuba diving and SCBA alloys.

See also

References

  1. I. J. Polmear, Light Alloys, Arnold, 1995
  2. Hombergsmeier, Elke (2007). "Magnesium for Aerospace Applications" (PDF). Archived from the original (PDF) on 6 September 2015. Retrieved 1 December 2012.
  3. SAE aluminium specifications list, accessed 8 October 2006. Also SAE Aerospace Council Archived 27 September 2006 at the Wayback Machine, accessed 8 October 2006.
  4. R.E. Sanders, Technology Innovation in aluminium Products, The Journal of The Minerals, 53(2):21–25, 2001. Online ed. Archived 17 March 2012 at the Wayback Machine
  5. "Sheet metal material". Archived from the original on 15 June 2009. Retrieved 26 July 2009.
  6. Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003). Materials and Processes in Manufacturing (9th ed.). Wiley. p. 133. ISBN 0-471-65653-4.
  7. "Understanding the Aluminum Alloy Designation System". Archived from the original on 29 July 2016. Retrieved 17 July 2016.
  8. "8xxx Series Alloys". aluMATTER.org. Archived from the original on 5 May 2014. Retrieved 6 May 2014.
  9. Davis, J.R. (2001). "Aluminum and Aluminum Alloys" (PDF). Alloying: Understanding the Basics. pp. 351–416. doi:10.1361/autb2001p351 (inactive 21 May 2020). ISBN 0-87170-744-6. Archived (PDF) from the original on 10 February 2017.
  10. https://www.aircraftmaterials.com/data/aluminium/1200.html
  11. Grushko, Ovsyannikov & Ovchinnokov 2016 (Chapter 1. Brief History of Aluminum-Lithium Alloy Creation)
  12. Toropova, L.S.; Eskin, D.G.; Kharakterova, M.L.; Dobatkina, T.V. (1998). Advanced Aluminum Alloys Containing Scandium Structure and Properties. Amsterdam: Gordon and Breach Science Publishers. ISBN 90-5699-089-6. Table 49
  13. ALLOY 2324-T39 PLATE
  14. Aluminum alloy Alclad 2029-T8
  15. "Aluminum alloy 2055-T84 extrusions" (PDF). Arconic Forgings and Extrusions. Archived (PDF) from the original on 26 October 2017. Retrieved 25 October 2017.
  16. Effect of Mg and Zn Elements on the Mechanical Properties and Precipitates in 2099 Alloy Archived 6 April 2017 at the Wayback Machine
  17. Precipitation of T1 and θ0 Phase in Al-4Cu-1Li-0.25Mn During Age Hardening: Microstructural Investigation and Phase-Field Simulation Archived 4 April 2017 at the Wayback Machine
  18. 2195 Aluminum Composition Spec
  19. Super Lightweight External Tank Archived 23 November 2013 at the Wayback Machine, NASA, retrieved 12 Dec 2013.
  20. "Falcon 9". SpaceX. 2013. Archived from the original on 10 February 2007. Retrieved 6 December 2013.
  21. Bjelde, Brian; Max Vozoff; Gwynne Shotwell (August 2007). "The Falcon 1 Launch Vehicle: Demonstration Flights, Status, Manifest, and Upgrade Path". 21st Annual AIAA/USU Conference on Small Satellites (SSC07 ‐ III ‐ 6). Archived from the original on 15 December 2013. Retrieved 6 December 2013.
  22. 2218 Aluminium Forged Products Billet For Airplane Engine Cylinder Head
  23. Aluminum alloy 2524-T3
  24. Kaufman, John Gilbert (2000). "Applications for Aluminium Alloys and Tempers". Introduction to aluminum alloys and tempers. ASM International. pp. 93–94. ISBN 978-0-87170-689-8.
  25. 3102 (AlMn0.2, A93102) Aluminum Archived 31 March 2017 at the Wayback Machine
  26. "Why Work with Aluminum 4047?". Lynch Metals, Inc. 23 January 2019. Retrieved 25 June 2019.
  27. Mogucheva A, Babich E, Ovsyannikov B, Kaibyshev R (January 2013). "Microstructural evolution in a 5024 aluminum alloy processed by ECAP with and without back pressure". Materials Science and Engineering: A. 560: 178–192. doi:10.1016/j.msea.2012.09.054.
  28. "POP® Micro Rivets". STANLEY® Engineered Fastening.
  29. ASM Handbook, Volume 5: Surface Engineering C.M. Cotell, J.A. Sprague, and F.A. Smidt, Jr., editors, p. 490 DOI: 10.1361/asmhba0001281
  30. Woldman’s Engineering Alloys, 9th Ed. (#06821G) ALLOY DATA/17
  31. ALLOY 6013 SHEET HIGHER STRENGTH WITH IMPROVED FORMABILITY
  32. New, Sleeker Samsung Smartphone Built Stronger with Alcoa’s Aerospace-Grade Aluminum
  33. ALLOY 6022 SHEET Higher Strength with Improved Formability
  34. Cubesat design Specifications Ref. 13 Archived 4 February 2012 at the Wayback Machine
  35. Placzankis, Brian E. (September 2009). General Corrosion Resistance Comparisons of Medium- and High-Strength Aluminum Alloys for DOD Systems Using Laboratory-Based Accelerated Corrosion Methods (Report). U.S. Army Research Laboratory. DTIC ADA516812; ARL-TR-4937. Retrieved 11 August 2018 via Internet Archive.
  36. Sahamit machinery 7022
  37. RSP alloys datasheet
  38. 7055 ALLOY-T7751 PLATE AND-T77511 EXTRUSIONS
  39. Aluminum alloy 7065
  40. Aluminum alloy 7085 High strength, high toughness, corrosion-resistant thick plate
  41. Aluminum alloy 7255-T7751 Very high strength, fatigue-resistant plate
  42. Y. Barbaux, G. Pons, "New rapidly solidified aluminium alloys for elevated temperature applications on aerospace structures", Journal de Physique IV Colloque, 1993, 03 (C7), pp.C7-191-C7-196
  43. R.B. Ross, "Metallic Materials Specification Handbook", p.1B-11
  44. Aluminum 8030 Alloy (UNS A98030)
  45. "Aluminum 8176 Alloy (UNS A98176)". AZO materials. 20 May 2013. Retrieved 22 June 2018.
  46. ASM Metals Handbook Vol. 2, Properties and Selection of Nonferrous Alloys and Special Purpose Materials, ASM International (p. 222)
  47. Gilbert Kaufman, J (2000). "2". Introduction to Aluminum Alloys and Tempers. ASM International. p. 14. ISBN 9781615030668.
  48. ASTM B 26 / B 26M – 05
  49. Parker, Dana T. Building Victory: Aircraft Manufacturing in the Los Angeles Area in World War II, p. 39, 118, Cypress, CA, 2013. ISBN 978-0-9897906-0-4.
  50. Ahmad, Zaki (2003). "The properties and application of scandium-reinforced aluminum". JOM. 55 (2): 35. Bibcode:2003JOM....55b..35A. doi:10.1007/s11837-003-0224-6.
  51. Marquis, Emmanuelle (2002). "Precipitation strengthening at ambient and elevated temperatures of heat-treatable Al(Sc) alloys". Acta Materialia. 50 (16): 4021. doi:10.1016/S1359-6454(02)00201-X.
  52. Vo, Nhon (2016). "Role of silicon in the precipitation kinetics of dilute Al-Sc-Er-Zr alloys". Materials Science and Engineering: A. 677 (20): 485. doi:10.1016/j.msea.2016.09.065.
  53. "Heat Resistant Superalloys". NanoAl. 2016. Archived from the original on 12 November 2016. Retrieved 11 November 2016.
  54. Vo, Nhon (2014). "Improving aging and creep resistance in a dilute Al-Sc alloy by microalloying with Si, Zr, and Er". Acta Materialia. 63 (15): 73. doi:10.1016/j.actamat.2013.10.008.
  55. Schwarz, James A.; Contescu, Cristian I.; Putyera, Karol (2004). Dekker encyclopedia of nanoscience and nanotechnology. 3. CRC Press. p. 2274. ISBN 0-8247-5049-7. Archived from the original on 28 January 2017.
  56. Bjerklie, Steve (2006). "A batty business: Anodized metal bats have revolutionized baseball. But are finishers losing the sweet spot?". Metal Finishing. 104 (4): 61. doi:10.1016/S0026-0576(06)80099-1.
  57. "Easton Technology Report : Materials / Scandium" (PDF). EastonBike.com. Archived (PDF) from the original on 23 November 2008. Retrieved 3 April 2009.
  58. "Small Frame (J) – Model 340PD Revolver". Smith & Wesson. Archived from the original on 30 October 2007. Retrieved 20 October 2008.
  59. Fundamentals of Flight, Shevell, Richard S., 1989, Englewood Cliffs, Prentice Hall, ISBN 0-13-339060-8, Ch 18, pp 373–386.
  60. Winston O. Soboyejo, T.S. Srivatsan, "Advanced Structural Materials: Properties, Design Optimization, and Applications", p. 245 Table 9.4. - Nominal composition of Aluminium Aerospace Alloys
  61. "Aluminum in Aircraft". Archived from the original on 21 April 2009. Retrieved 21 April 2009.
  62. Wagner, PennyJo (Winter 1995). "Aircraft aluminum". Archived from the original on 5 April 2009. Retrieved 21 April 2009.
  63. "Aluminum Alloy 4047". Lynch Metals, Inc. Archived from the original on 27 February 2017. Retrieved 24 July 2017.
  64. "Aluminum Alloy 6951". Lynch Metals, Inc. Archived from the original on 27 February 2017. Retrieved 24 July 2017.
  65. Karthikeyan, L.; Senthil Kumar, V.S. (2011). "Relationship between process parameters and mechanical properties of friction stir processed AA6063-T6 aluminum alloy". Materials and Design. 32 (5): 3085–3091. doi:10.1016/j.matdes.2010.12.049.
  66. Boatbuilding with aluminium, Stephen F. Pollard, 1993, International Marine, ISBN 0-07-050426-1
  67. Kaufman, John (2000). Introduction to aluminum alloys and tempers (PDF). ASM International. pp. 116–117. ISBN 0-87170-689-X. Archived (PDF) from the original on 15 December 2011. Retrieved 9 November 2011.
  68. "A short Review of 6351 Alloy Aluminum Cylinders". Professional Scuba Inspectors. 1 July 2011. Archived from the original on 10 December 2013. Retrieved 18 June 2014.

Bibliography

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