Alloy 7050 strictly controls its iron and silicon content, it is a new high-purity aluminum alloy that combines high strength with good fracture toughness.
| Main composition | Zn | Mg | Cu | Zr | Al |
|---|---|---|---|---|---|
| 7050 | 6.2 | 2.25 | 2.3 | 0.12 | Balance |
- It uses zirconium instead of chromium as a recrystallization and grain control additive;
- Its copper/magnesium ratio is larger, which is greater than 0.8.
| 7050 composition (wt.%) | Min | Max |
|---|---|---|
| Zn | 5.7 | 6.7 |
| Cu | 2.0 | 2.6 |
| Mg | 1.9 | 2.6 |
| Zr | 0.08 | 0.15 |
| Fe | — | 0.15 |
| Si | — | 0.12 |
| Mn | — | 0.10 |
| Ti | — | 0.06 |
| Cr | — | 0.04 |
| Other impurities | ||
| each | — | 0.05 |
| total | — | 0.15 |
| Al | Balance | |
Mechanical properties： (Longitudinal direction)
| Alloy | T.S. (MPa) | Y.S. (MPa) | Elongation(%) | Density(gcm3) |
|---|---|---|---|---|
| 7050-T7651 | 524 | 455 | 6 | 2.83 |
| 7050-T7451 | 510 | 441 | 10 | 2.83 |
| 7050 aging | Strength | Combination of strength, stress corrosion resistance and toughness |
|---|---|---|
| Thick section | Better than 7075 | Better than 7075 |
| Thin section | 7050-T76 is equivalent to 7075-T6 | Better than 7075 |
| 7050 | Tensile strength | Resistant to SCC | Fracture toughness |
|---|---|---|---|
| 7050-T73 | low | high | high |
| 7050-T74 | middle | middle | middle |
| 7050-T76 | high | low | low |
7050 aluminum alloy should be considered for any aerospace application that requires the level of strength offered by 7075-T6 and 7079-T6 alloys along with high resistance to stress corrosion, exfoliation corrosion and good toughness.
Application：
For industrial applications that require high strength and good stress corrosion resistance and fracture toughness, such as bicycle suspension fork tubes, baseball bats and lacrosse, 7050 is undoubtedly a very good aluminum alloy that it can providing the high tensile strength, good corrosion resistance and fatigue resistance.
References：
1.AIWT, Aerospace Structural Metals Handbook, Nonferrous Alloys, 7050Al
Standards：
AMS 4050、AMS4107、AMS4108
