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Wrought aluminium zinc alloy From Wikipedia, the free encyclopedia
7022 aluminium alloy is an alloy in the wrought aluminium-zinc family (7000 or 7xxx series). It is one of the more complex grades in the 7000 series, with at least 87.85% aluminium by weight.
A7022 T651 | |
---|---|
Physical properties | |
Density (ρ) | 2.77 g/cm3 |
Mechanical properties | |
Young's modulus (E) | 70 GPa |
Tensile strength (σt) | 440 MPa (64 ksi) |
Elongation (ε) at break | 6% |
Poisson's ratio (ν) | 0.33 |
Hardness—Rockwell | 81 HRB |
Thermal properties | |
Thermal conductivity (k) | 165 W/m*K |
Linear thermal expansion coefficient (α) | 2.35*10−5 K−1 |
Like most other highly alloyed alloys, 7022 is a high strength alloy, with yield strength of 370 MPa. Designed to be resistant to stress corrosion cracking, it has decent corrosion and oxidation resistance comparable to 7075 aluminium alloy[1] but worse than 7039 aluminium alloy. Good machinability, thermal conductivity and dimensional stability make 7022 alloy a material of choice for plastic injection molds.[2]
7022 alloy can be heat treated to increase tensile strength in expense of workability, with most common grade been T651.
Notes: Alternative names for 7022 alloy are A7022 and AA7022.
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