7175 aluminium alloy is typically utilised in applications where improved formability and toughness are required. Used extensively in the aerospace industry, the combination of high mechanical strength, fracture toughness and stress corrosion cracking resistance, makes this alloy suitable for structural aircraft applications. The T-73 temper eliminates the development of stress corrosion cracking (SCC).
Alloy 7175 is typically used for:
Alloy 7175
Spec: weight %
| Chemical Element | % Present |
|---|---|
| Silicon (Si) | 0.0 - 0.15 |
| Iron (Fe) | 0.0 - 0.20 |
| Copper (Cu) | 1.20 - 2.00 |
| Manganese (Mn) | 0.0 - 0.10 |
| Magnesium (Mg) | 2.10 - 2.90 |
| Chromium (Cr) | 0.18 - 0.28 |
| Zinc (Zn) | 5.10 - 6.10 |
| Titanium (Ti) | 0.0 - 0.10 |
| Others (Each) | 0.05 max |
| Others (Total) | 0.15 max |
| Aluminium (Al) | Balance |
Alloy 7175
| Property | English Value | Metric Value |
|---|---|---|
| Nominal Density (68 °F/20 °C) | 0.101 lbs./in.³ | 2.80 Mg/m³ |
| Melting Range | 990 °F - 1175 °F | 532 °C - 635 °C |
| Specific Heat (212 °F/100 °C) | 0.207 BTU/lb. · °F | 865 J/kg · K |
| Coefficient of Thermal Expansion - Linear (68 °F-212 °F / 20 °C-100 °C) | 13.0 µin/in · °F | 23.4 µm/m · K |
| Coefficient of Thermal Expansion - Volumetric (68 °F/20 °C) | 3.78 x 10⁻⁵ in.³/in.³ · °F | 68 x 10⁻⁶ m³/m³ · K |
| Thermal Conductivity - T651 | 82 BTU/ft · hr · °F | 142 W/m · K |
| Thermal Conductivity - T7351 | 94 BTU/ft · hr · °F | 163 W/m · K |
| Electrical Conductivity - Equal Volume (T651) | 36% IACS | 36% IACS |
| Electrical Conductivity - Equal Volume (T7351) | 42% IACS | 42% IACS |
| Electrical Conductivity - Equal Volume (T651) | 107% IACS | 107% IACS |
Alloy 7175 weldability is Rated Poor.
