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The 2024 alloy is thought of as the “aircraft” alloy given its strength. This alloy has only fair corrosion resistance but good machinability. Lends itself only to resistance welding as a hot joining process and is not recommended for brazing or soldering. In the annealed state, it has good workability but is only fair-to-poor in tempers. Typical end uses are aircraft skins and cowls as well as truck and aircraft structural parts.
| Others | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Weight % | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Each | Total | Aluminium |
| Minimum | — | — | 3.8 | 0.3 | 1.2 | — | — | — | — | — | Remainder |
| Maximum | 0.5 | 0.5 | 4.9 | 0.9 | 1.8 | 0.10 | 0.25 | 0.15 | 0.05 | 0.15 | |
| Characteristics | English | Metric | |
|---|---|---|---|
| Nominal density
(68°F/20°C) |
0.100 lbs/in3 | 2.77 mg/m3 | |
| Melting range | 935°F- 1180°F | 502°C- 638°C | |
| Specific heat
(212 °F/100°C) |
0.209 BTU/lb – °F | 875 J/KG- °K | |
| Coefficient of thermal expansion | Linear
68°F – 212°F 20°C – 100°C |
12.7 micro in/in- °F | 22.9 micro in/in- °K |
| Volumetric
68 ºF / 20 ºC |
3.67 x 10-5 in .3/in.3 – ºF | 66 x 10-6 m3/m3 – ºK | |
| Thermal conductivity
(68°F/20°C) |
O Temper | 110 BTU/ft- hr – °F | 190 W/m – °K |
| T4, T351 | 69 BTU/ft- hr – °F | 120 W/m – °K | |
| T6, T851 | 88 BTU/ft- hr – °F | 151 W/m – °K | |
| Electrical conductivity
(68°F/20°C) |
Equal Volume | O Temper | 50% IACS |
| T4, T351 | 30% IACS | ||
| T6, T851 | 38% IACS | ||
| Equal Weight | O Temper | 160% IACS | |
| T4, T351 | 96% IACS | ||
| T6, T851 | 122% IACS |
| Temper | Tensile | Hardness | Shear | Fatigue | Modulus | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation/ 4D | Brinell 500 kg 10 mm | Ultimate shearing strength | Endurance limit-R.R.Moore type | Modulus of elasticity | |||||||
| KSI | MPa | KSI | MPa | 1/16 In. Thick Speciman | KSI | MPa | KSI | MPa | KSIx103 | Gpa | |||
| O | 31.9 | 220 | 13.8 | 95.0 | 12 | 47 | 18 | 124 | 13 | 89.6 | 10.6 | 73.1 | |
| T-4, T-351 |
58-61 | 400-425 | 37.7 | 260 | 20 | 120 | 41 | 283 | 20 | 138 | 10.6 | 73.1 | |
| T-6 | 63.1-63.8 | 435-440 | 50 | 345 | 5 | 125 | 41 | 283 | 18 | 124 | 10.6 | 73.1 | |
| T-851 | 66 | 455 | 58 | 400 | 5 | 128 | 42.9 | 296 | 17 | 117 | 10.6 | 73.1 | |
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