7022 aluminium alloy
| 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 |
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.
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.
Chemical Composition
[edit]- Aluminium: 88.35 to 92.4%
- Zinc: 4.3 to 5.2%
- Magnesium: 2.6 to 3.7%
- Copper: 0.5 to 1.0%
- Manganese: 0.1 to 0.4%
- Chromium: 0.1 to 0.3%
- Silicon: 0.5% max
- Iron: 0.5% max[3]
- Titanium: 0.2% max
- Zirconium: 0.2% max
- Other: 0.15% max
See also
[edit]- Aleris (first maker of A7022)