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The 7050 alloy is used in aircraft structural parts. This alloy has characteristics of high strength coupled with good resistance to exfoliation and stress corrosion cracking (SCC). It also has good fracture toughness and fatigue resistance.
| Other | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weight % | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Zr | Each | Total | Aluminum |
| minimum | — | — | 2.00 | — | 1.90 | — | 5.70 | — | 0.08 | — | — | Remainder |
| maximum | 0.12 | 0.15 | 2.60 | 0.10 | 2.60 | 0.04 | 6.70 | 0.06 | 0.15 | 0.05 | 0.15 | |
| Characteristics | English | Metric | |
|---|---|---|---|
| Nominal density
(68°F/20°C) |
0.102 lbs/in3 | 2.83 Mg/m3 | |
| Melting range | 870°F-1175°F | 524°C-635°C | |
| Coefficient of thermal expansion | Linear
68°F – 212°F 20°C – 100°C |
13.1 micro in/in- °F | 23.5 micro m/m- °K |
| Volumetric
68°F / 20°C |
3.78 x 10-5 in.3/in.3– °F | 68 x 10-6 m3/m3– °K | |
| Thermal conductivity
(68°F/20°C) |
T76, T76511 | 89 BTU/ft- hr – °F | 154 W/m – °K |
| T3, T7351, T74, T74511 | 91 BTU/ft- hr – °F | 157 W/m – °K | |
| Electrical conductivity
(68°F/20°C) |
Equal Volume | T76, T76511 | 39.5% IACS |
| T3, T7351, T74, T74511 | 40.5% 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 | 0.500″ Dia. Specimen | KSI | MPa | KSI | MPa | KSIx103 | Gpa | ||
| T74511 | 76 | 524 | 68 | 469 | 11 | 140 | 44 | 303 | — | — | 10.2 | 70.3 |
| T76511 | 80 | 552 | 71 | 489 | 11 | 150 | 47 | 324 | — | — | 10.2 | 70.3 |
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