Aluminum 7075-T6; 7075-T651

Aluminum 7075-T6; 7075-T651

Subcategory: 7000 Series Aluminum Alloy; Aluminum Alloy; Metal; Nonferrous Metal

Close Analogs:

Composition Notes:
A Zr + Ti limit of 0.25 percent maximum may be used with this alloy designation for extruded and forged products only, but only when the supplier or producer and the purchaser have mutually so agreed. Agreement may be indicated, for example, by reference to a standard, by letter, by order note, or other means which allow the Zr + Ti limit.
Aluminum content reported is calculated as remainder.
Composition information provided by the Aluminum Association and is not for design.

Key Words: Aluminium 7075-T6; Aluminium 7075-T651, UNS A97075; ISO AlZn5.5MgCu; Aluminium 7075-T6; Aluminium 7075-T651; AA7075-T6

Component    Wt. %
Al 87.1 – 91.4
Cr 0.18 – 0.28
Cu 1.2 – 2
Fe Max 0.5
Component    Wt. %
Mg 2.1 – 2.9
Mn Max 0.3
Other, each Max 0.05
Other, total Max 0.15
Component    Wt. %
Si Max 0.4
Ti Max 0.2
Zn 5.1 – 6.1

Material Notes: 
General 7075 characteristics and uses (from Alcoa): 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.

Data points with the AA note have been provided by the Aluminum Association, Inc. and are NOT FOR DESIGN.

Physical Properties

Physical Properties Metric English Comments
Density 2.81 g/cc 0.102 lb/in³  AA; Typical

Mechanical Properties

Hardness, Brinell 150 150  AA; Typical; 500 g load; 10 mm ball
Hardness, Knoop 191 191  Converted from Brinell Hardness Value
Hardness, Rockwell A 53.5 53.5  Converted from Brinell Hardness Value
Hardness, Rockwell B 87 87  Converted from Brinell Hardness Value
Hardness, Vickers 175 175  Converted from Brinell Hardness Value
Ultimate Tensile Strength 572 MPa 83000 psi  AA; Typical
Tensile Yield Strength 503 MPa 73000 psi  AA; Typical
Elongation at Break 11 % 11 %  AA; Typical; 1/16 in. (1.6 mm) Thickness
Elongation at Break 11 % 11 %  AA; Typical; 1/2 in. (12.7 mm) Diameter
Modulus of Elasticity 71.7 GPa 10400 ksi  AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus.
Poisson’s Ratio 0.33 0.33
Fatigue Strength 159 MPa 23000 psi  AA; 500,000,000 cycles completely reversed stress; RR Moore machine/specimen
Fracture Toughness 20 MPa-m½ 18.2 ksi-in½  K(IC) in S-L Direction
Fracture Toughness 25 MPa-m½ 22.8 ksi-in½  K(IC) in T-L Direction
Fracture Toughness 29 MPa-m½ 26.4 ksi-in½  K(IC) in L-T Direction
Machinability 70 % 70 %  0-100 Scale of Aluminum Alloys
Shear Modulus 26.9 GPa 3900 ksi
Shear Strength 331 MPa 48000 psi  AA; Typical

Electrical Properties

Electrical Resistivity 5.15e-006 ohm-cm 5.15e-006 ohm-cm  AA; Typical at 68°F

Thermal Properties

CTE, linear 68°F 23.6 µm/m-°C 13.1 µin/in-°F  AA; Typical; Average over 68-212°F range.
CTE, linear 250°C 25.2 µm/m-°C 14 µin/in-°F  Average over the range 20-300ºC
Specific Heat Capacity 0.96 J/g-°C 0.229 BTU/lb-°F
Thermal Conductivity 173 W/m-K 1200 BTU-in/hr-ft²-°F
Melting Point 477 – 635 °C 890 – 1175 °F  AA; Typical range based on typical composition for wrought products 1/4 inch thickness or greater. Homogenization may raise eutectic melting temperature 20-40°F but usually does not eliminate eutectic melting.
Solidus 477 °C 890 °F  AA; Typical
Liquidus 635 °C 1175 °F  AA; Typical

Processing Properties

Annealing Temperature 413 °C 775 °F
Solution Temperature 466 – 482 °C 870 – 900 °F
Aging Temperature 121 °C 250 °F