Aluminium / Aluminum 7050 Alloy (UNS A97050)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Forming
     Welding
     Heat Treatment
     Cold Working
     Aging
     Hardening
Applications

Introduction

Aluminum alloys have high strength at subzero temperatures. However, their strength can be reduced at high temperatures.

Aluminium / Aluminum 7050 alloy is a heat treatable alloy. It has high toughness, strong mechanical strength, and good stress corrosion cracking resistance. The following datasheet gives an overview of Aluminium / Aluminum 7050 alloy.

Chemical Composition

The following table shows the chemical composition of Aluminium / Aluminum 7050 alloy.

Element Content (%)
Aluminum, Al 89
Copper, Cu 2.3
Magnesium, Mg 2.3
Zinc, Zn 6.2
Zirconium, Zr 0.12

Physical Properties

The physical properties of Aluminium / Aluminum 7050 alloy are tabulated below.

Properties Metric Imperial
Density 2.6-2.8 g/cm3 0.0939-0.101 lb/in3
Melting point 494°C 920°F

Mechanical Properties

The mechanical properties of Aluminium / Aluminum 7050 alloy are outlined in the following table.

Properties Metric Imperial
Tensile strength 515 MPa 74695 psi
Yield strength 455 MPa 65992 psi
Fatigue strength 240 MPa 34809 psi
Elastic modulus 70-80 GPa 10153-11603 ksi
Poisson's ratio 0.33 0.33
Elongation 11% 11%

Thermal Properties

The thermal properties of Aluminium / Aluminum 7050 alloy are given in the following table.

Properties Conditions
T (ºC) Treatment
Thermal conductivity 180 W/mK 25 -

Other Designations

Other designations that are equivalent to Aluminium / Aluminum 7050 alloy include:

  • AMS 4108
  • AMS 4201
  • ASTM B247
  • ASTM B316
  • QQ A-430

Fabrication and Heat Treatment

Forming

Aluminium / Aluminum 7050 alloy can be formed in O temper or heat treated conditions.

Welding

Aluminium / Aluminum 7050 alloy should not be welded in order to prevent cracking and development of porosity. The weld joint produced will be weaker than the parent metal. Gas tungsten or gas metal arc welding methods are not preferred for welding this alloy.

Heat Treatment

Aluminium / Aluminum 7050 alloy can be heat treated at 477°C (890°F). The time taken for this process is based upon the thickness of the section.

Cold Working

Aluminium / Aluminum 7050 alloy can be cold worked using conventional methods.

Aging

Aluminium / Aluminum 7050 alloy is aged using two-stage heat treatment. It is heated at 122°C (250°F) for 3 to 6 h. It is again heated at 163°C (325°F) for 15 h followed by cooling in air.

Hardening

Aluminium / Aluminum 7050 alloy can be hardened by precipitation heat treatment.

Applications

Aluminium / Aluminum 7050 alloy is mainly used in manufacturing aircraft and other structures.

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