Effect of Heat Treatment on Microstructures and Mechanical Properties of A356 Alloy by Low Pressure Casting

Abstract

Automobile wheel of A356 alloy was cast by low pressure casting process. The effect of heat treatment process on microstructures and mechanical properties of A356 alloy cast was discussed. The results indicated that optimal parameters of heat treatment process for A356 alloy included solution temperature of 535°Cand holding time of 4.5hours, aging temperature of 145°Cand holding time of 4hours. Ultimate strength of A356 is 270MPa and elongation rate is 10%. Meanwhile, the microstructure has been apparently improved. The eutectic silicon particle became more spheroidal and distributed uniformly in matrix.

Mechanical Properties and Microstructure of A356-T6 Aluminum Alloy Wheel Hub Based on Casting-Spinning Process

“…Moreover, Nikolaos [8] studied the effects of different aging conditions such as under aging, peak aging and over aging on the impact mechanical behavior of A357 (Al-7Si-0.7Mg) aluminum alloy, obtaining the toughness-brittle fracture transition mechanism of it. Yu [9] obtained the best parameters for the heat treatment process of A356 aluminum alloy as solid solution at 535°C for 4.5h and aging at 145°C for 4h. After heat treatment, its ultimate tensile strength and elongation reached 270MPa and 10% with the eutectic silicon particles in the microstructure spheroidzed and uniformly distributed in the matrix.…”