Aluminum 7075-T73; 7075-T735x
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: AA7075-T73; AA7075-T735, UNS A97075; ISO AlZn5.5MgCu; Aluminium 7075-T73; Aluminium 7075-T735x
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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.
Uses: Aircraft fittings, gears and shafts, fuse parts, meter shafts and gears, missile parts, regulating valve parts, worm gears, keys, aircraft, aerospace and defense applications.
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 | 135 | 135 | 500 kg load with 10 mm ball. Calculated value. |
| Hardness, Knoop | 120 | 120 | Converted from Brinell Hardness Value |
| Hardness, Rockwell A | 50.5 | 50.5 | Converted from Brinell Hardness Value |
| Hardness, Rockwell B | 82 | 82 | Converted from Brinell Hardness Value |
| Hardness, Vickers | 155 | 155 | Converted from Brinell Hardness Value |
| Tensile Strength, Ultimate | 505 MPa | 73200 psi | |
| Tensile Strength, Yield | 435 MPa | 63100 psi | |
| Elongation at Break | 13 % | 13 % | In 5 cm; Sample 1.6 mm thick |
| Modulus of Elasticity | 72 GPa | 10400 ksi | Average of Tension and Compression. In Aluminum alloys, the compressive modulus is typically 2% greater than the tensile modulus |
| Poisson’s Ratio | 0.33 | 0.33 | |
| Fatigue Strength | 150 MPa | 21800 psi | 500,000,000 Cycles |
| Fracture Toughness | 20 MPa-m½ | 18.2 ksi-in½ | Plate. K(IC) in SL direction |
| Fracture Toughness | 20 MPa-m½ | 18.2 ksi-in½ | Plate. K(IC) in T-L direction |
| Fracture Toughness | 32 MPa-m½ | 29.1 ksi-in½ | Plate. K(IC) in L-T Direction |
| Machinability | 70 % | 70 % | 0-100 Scale of Aluminum Alloys |
| Shear Modulus | 26.9 GPa | 3900 ksi | |
| Shear Strength | 300 MPa | 43500 psi | Calculated value. |
Electrical Properties
| Electrical Resistivity | 4.3e-006 ohm-cm | 4.3e-006 ohm-cm |
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 | 155 W/m-K | 1080 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 | 107 °C | 225 °F | two stage treatment – second stage 325 to 350°F |