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Effect of Heat Treatment on Microstructure and Properties of Hyper-eutectic Al-Si-based Alloy

Rongde Li

Abstract

The effects of the heat treatment on microstructure and performance of hyper-eutectic Al-Si alloy were studied.The microstructure was analyzed by SEM.The results show that heat treatment has important effect on mechanical properties of the alloy.The tensile strength of Al-Si alloy at room-temperature increases after soluting at 525 ℃ for 4 h and aging at 175 ℃ for 10 h.The fusing of silicon phase and the graining of the second phases has made the mechanical properties of the alloy enhanced.The T6 heat treatment can improve microstructure shape and distribution,These changes can enhance mechanical properties of the alloy.

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Key concepts: Microstructure, Eutectic system, Alloy, Materials science, Ultimate tensile strength, Metallurgy, Phase (matter), Silicon