The casting performance of 7075 aluminum alloy is mainly reflected in its casting process, mechanical properties, and thermal conductivity. ‌

Casting process

The casting process of 7075 aluminum alloy includes metal mold casting, liquid extrusion casting, and semi-solid extrusion casting. Different casting methods have a significant impact on the properties of 7075 aluminum alloy:

Metal mold casting: coarse grains result in lower plasticity and tensile strength, but higher thermal conductivity.

Liquid extrusion casting: grain refinement, high tensile strength and elongation, but the lowest thermal conductivity.

Semi solid squeeze casting: The grains are dense, fine, and round, with the highest tensile strength and elongation, and moderate thermal conductivity.

mechanical property

7075 aluminum alloy has excellent mechanical properties, with specific parameters as follows:

Untreated (7075-0): The maximum tensile strength is 280 MPa, the yield strength is 140 MPa, and the elongation is 9-10%.

T6 tempering treatment: The ultimate tensile strength is 510-540 MPa, the yield strength is at least 430-480 MPa, and the failure elongation is 5-11%.

Thermal conductivity

Different casting methods have a significant impact on the thermal conductivity of 7075 aluminum alloy:

Metal mold casting: The highest thermal conductivity reaches 139.67 W/(m · K).

Liquid extrusion casting: The lowest thermal conductivity is 120.94 W/(m · K).

Semi solid extrusion casting: thermal conductivity of 126.07 W/(m · K).