to Wrought aluminum-zinc-magnesium alloys (7xxx)
to Properties of aluminum alloys
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| Wrought aluminum-zinc-magnesium alloy 7178 | ||||
| Chemical composition: Cu=2.0%, Mg=2.8%, Cr=0.26% Zn=6.8%, Al balance | ||||
| Property | Value in metric unit | Value in US unit | ||
| Density | 2.83 *10³ | kg/m³ | 177 | lb/ft³ |
|---|---|---|---|---|
| Modulus of elasticity | 72 | GPa | 10400 | ksi |
| Thermal expansion (20 ºC) | 23.4*10-6 | ºCˉ¹ | 13.0*10-6 | in/(in* ºF) |
| Specific heat capacity | 856 | J/(kg*K) | 0.205 | BTU/(lb*ºF) |
| Thermal conductivity | 150 | W/(m*K) | 1040 | BTU*in/(hr*ft²*ºF) |
| Electric resistivity | 4.6*10-8 | Ohm*m | 4.6*10-6 | Ohm*cm |
| Tensile strength (annealed) | 228 | MPa | 33000 | psi |
| Yield strength (annealed) | 103 | MPa | 15000 | psi |
| Elongation (annealed) | 15 | % | 15 | % |
| Shear strength (annealed) | 150 | MPa | 21800 | psi |
| Hardness (annealed) | 60 | HB | 60 | HB |
| Tensile strength (T6, T651) | 607 | MPa | 88000 | psi |
| Yield strength (T6, T651) | 538 | MPa | 78000 | psi |
| Elongation (T6, T651) | 10 | % | 10 | % |
| Shear strength (T6, T651) | 360 | MPa | 52200 | psi |
| Fatigue strength (T6, T651) | 150 | MPa | 21800 | psi |
| Hardness (T6, T651) | 160 | HB | 160 | HB |
| Annealing temperature | 413 | ºC | 775 | ºF |
| Solution temperature | 468 | ºC | 875 | ºF |
| Aging temperature | 121 | ºC | 250 | ºF |