Forming properties and microstructure of Al-Cu alloy prepared by liquid-die forging

Abstract

The Al-Cu wheel adopting the new Al alloy was prepared by the liquid-die forging, and the mechanical properties, composition distribution, microstructure and fracture behavior were investigated. The results showed that serious Cu segregation was found in the wheel specimen; the microstructure of the Al-Cu wheel was comprised of the casting microstructure and a small amount of the deformed microstructure; the best heat treatment and water quenching system were found to solution treated at (530±5) °C for 4 h followed by (535±5) °C for 24 h and aging treated at (155±5) °C for 4 h; the fracture morphologies of the samples heated under T6 and T5-1 heat treatment showed flat, tough nest, and poor plastic characteristics; the fracture morphologies of the samples heated under T4 heat treatment exhibited complete resilience, but no residual metallographic characteristic; the sample treated under T4 protocol had the best elongation; the fracture failure was mainly due to the formation of the CuAl₂(θ) phases; and the fracture mechanism of the Al-Cu wheel was intergranular fracture.

Keywords

forming properties / microstructure / liquid-die / Al-Cu alloy

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