7022 aluminium alloy

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 break6%
Poisson's ratio (ν)0.33
Hardness—Rockwell81 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.

Chemical Composition
  1. Aluminium: 88.35 to 92.4%
  2. Zinc: 4.3 to 5.2%
  3. Magnesium: 2.6 to 3.7%
  4. Copper: 0.5 to 1.0%
  5. Manganese: 0.1 to 0.4%
  6. Chromium: 0.1 to 0.3%
  7. Silicon: 0.5% max
  8. Iron: 0.5% max[3]
  9. Titanium: 0.2% max
  10. Zirconium: 0.2% max
  11. Other: 0.15% max

See also

References
  1. General Corrosion Resistance Comparisons of Medium- and High-Strength Aluminum Alloys for DOD Systems Using Laboratory-Based Accelerated Corrosion Methods
  2. Sahamit machinery 7022
  3. matweb.com 7022 Aluminum Composition Spec

Aluminum alloy table
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