How 7075 Aluminum Alloy Is Used in Manufacturing
Thanks to its exceptional strength and excellent fatigue resistance, 7075 aluminum alloy is widely applied across multiple manufacturing industries. It is frequently selected for mold and tooling production because of its good machinability and strong resistance to wear during repeated use. However, since 7075 aluminum is prone to stress-corrosion cracking, components used in high-stress or aggressive environments are typically protected with surface coatings or cladding to extend service life and ensure reliability. At GNEE, appropriate surface treatments can be provided based on application requirements.
Types of 7075 Aluminum Alloy
7075 aluminum alloy is a heat-treatable, high-strength aluminum-zinc alloy, with zinc as its primary alloying element. Its outstanding mechanical performance makes it ideal for applications demanding very high strength. The alloy is available in several tempers, each defined by a specific heat-treatment process and designed for different performance needs.
1. 7075-O
The 7075-O temper is supplied in a non-heat-treated, fully annealed condition. It offers a maximum tensile strength of about 220 MPa (32,000 psi) and a yield strength of approximately 145 MPa (21,000 psi). Compared with T6, it provides better corrosion resistance but lower strength, making it suitable for applications where corrosion resistance is prioritized over maximum mechanical performance.
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2. 7075-T6
The 7075-T6 temper is solution heat treated and artificially aged to achieve maximum strength. It typically delivers a yield strength of around 480 MPa (69,000 psi) and an ultimate tensile strength of approximately 510–560 MPa (74,000–81,000 psi). This temper is widely used in aerospace structures due to its high strength; however, it is more susceptible to stress-corrosion cracking, so protective finishes or alternative over-aged tempers are often specified for critical components supplied by GNEE.
3. 7075-T651
The 7075-T651 temper offers mechanical properties similar to T6, with an ultimate tensile strength of about 570 MPa (83,000 psi) and a yield strength of approximately 500 MPa (73,000 psi). The key difference is the stress-relief process, which improves dimensional stability and reduces the risk of distortion during machining. This makes 7075-T651 particularly suitable for precision-machined parts.
