Aluminum 7050

Material Data Sheet

7050 Aluminum plate is a top choice for use in aerospace applications requiring the use of metals that have a great combination of resistance to SCC (stress corrosion cracking), strength, and toughness. It is commonly used for plate applications that are between three and six inches thick. Compared to 7075 grade alloys, 7050 aluminum has a higher resistance to corrosion and better toughness. 7050 Aluminum tends to be used in thicker sections because it has less quench sensitivity compared to other aerospace aluminum alloys. This enables it to maintain its strength properties, resistance to stress corrosion cracking, and fracture toughness.

The applications that commonly use 7050 aluminum alloy include bulkheads and fuselage frames that require sections to be between two and six inches thick. Another common application is for wing skins. 7050 Aluminum doesn’t have a good cold workability, but can instead be machined. It has good anodizing response as well. It is not recommended to use welding methods for joining, such as brazing, gas shielded arc welding, or coated metal arc welding.

Chemical Composition
Element Content (%)
Aluminum, Al 87.3 – 90.3
Zinc, Z 5.7 – 6.7
Copper, Cu 2.0 – 2.6
Magnesium, Mg 1.9 – 2.6
Zirconium, Zr 0.08 – 0.15
Iron, Fe ≤ 0.15
Silicon, Si ≤ 0.12
Mangnese, Mn ≤ 0.10
Titanium, Ti ≤ 0.06
Chromium, Cr ≤ 0.04
Physical Properties
Property Metric Imperial
Density 2.6-2.8 g/cm3 0.0939-0.101 lb/in3
Melting Point 494°C 920°F
Mechanical Properties
Property Metric Imperial
Hardness, Brinell 140 140
Hardness, Knoop 177 177
Hardness, Rockewell A 51.6 51.6
Hardness, Rockwell B 84 84
Hardness, Vickers 162 162
Ultimate Tensile Strength 524 MPa 76000 psi
Tensile Yield Strength 469 MPa 68000 psi
Elongation at Break 11% 11%
Modulus of Elasticity 71.6 GPa 10400 ksi
Poisson’s Ratio 0.33 0.33
Shear Modulus 26.9 GPa 3900 ksi
Shear Strength 303 MPa 44000 psi
Thermal Properties
Property Metric Imperial
Specific Heat Capacity 0.860 J/g-°C 0.206 BTU/lb-°F
Thermal Conductivity 157 W/m-K 1090 BTU-in/hr-ft²-°F
Solidus 488 °C 910 °F
Liquidus 629.4 °C 1165 °F
Specifications
  • AMS 4050: 7050-T7451 Plate
  • AMS 4107:7050-T74 Die Forging
  • AMS 4108:7050-T7452 Hand Forgings
  • AMS 4201: 7050-T7651 Plate
  • AMS 4333: 7050-T7452 Forgings
  • AMS 4340: 7050-T76511 Extrusions
  • AMS 4341: 7050-T73511 Extrusions
  • AMS 4342: 7050-T74511 Extrusions
  • ASTM B247
  • ASTM B316
  • QQ A-430
  • DMS-2233
  • BMS 7-323
Applications

• Fuselage frames
• Bulkheads
• Wing skins

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