Material Specifications - 7075 T6 Aluminium Alloy

Material Specifications
7075 T6 Aluminium Alloy

About 7xxx Series Alloys

Zinc is the primary alloying agent for this series, and when magnesium is added in a smaller amount, the result is a heat-treatable, very high strength alloy.  Other elements such as copper and chromium may also be added in small quantities.  The most commonly known alloys are 7050 and 7075, which are widely used in the aircraft industry.

Characteristics

7075 T6 is a very high strength material used for highly stressed structural parts. The T7351 temper offers improved stress-corrosion cracking resistance.

Applications

Aircraft fittings, gears and shafts, fuse parts, meter shafts and gears, missile parts, regulating valve parts, worm gears, keys, aircraft, aerospace and defense applications; bike frames, all terrain vehicle (ATV) sprockets.

Technical Specifications

The guaranteed minimum mechanical properties of 7075 T6 alloy are tabulated below.

Physical Properties Metric
Density 2.81 g/cc
Mechanical Properties Metric
Hardness, Brinell 150
Hardness, Vickers 175
Tensile Strength, Ultimate 572 MPa
Tensile Strength, Yield 503 MPa
Elongation at Break 11.0%
Poissons Ratio 0.33
Fatigue Strength 159 MPa
Machinability 70 %
Shear Modulus 26.9 GPa
Shear Strength 331 MPa
Electrical Properties Metric
Electrical Resistivity 0.00000515 ohm-cm @ 20 °C
Thermal Properties Metric
CTE, linear 23.6 µm/m-°C
Specific Heat Capacity 0.960 J/g-°C
Thermal Conductivity  130 W/m-K
Melting Point 477 - 635 °C
Solidus  477 °C
Liquidus  635 °C
Processing Properties Metric
Annealing Temperature 413 °C
Solution Temperature 466 - 482 °C
Aging Temperature 121 °C
Component Elements Properties Metric
Aluminum, Al 87.1 - 91.4 %
Chromium, Cr 0.18 - 0.28 %
Copper, Cu 1.2 - 2.0 %
Iron, Fe <= 0.50 %
Magnesium, Mg 2.1 - 2.9 %
Manganese, Mn <= 0.30 %
Other, each <= 0.05 %
Other, total <= 0.15 %
Silicon, Si  <= 0.40 %
Titanium, Ti  <= 0.20 %
Zinc, Zn  5.1 - 6.1 %