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