Abstract：The influence of liquid volume fraction changing with different sintering temperature and time on alloy microstructure and mechanical properties during sintering process with nominal composition Al–15Si–26Cu–057Mg was investigated. The results indicated that sintering at 560 ℃ by heating up under 10 ℃/min was the optimum temperature because that the volume fraction of 13% was benefit for alloy mechanical properties. The volume fraction of liquid phase began to stabilize after holding for 40 min at 560 ℃.The strength of alloy increased gradually with liquid phase distributing uniformly in the alloy by longer sintering time. Therefore sintering for 1 h at 560 ℃was the optimum condition. The dissolution of θ phase began around 500 ℃ and the dissolution of Q phase was around 510 ℃ to 535 ℃ during process of the temperature heating up so that the transformation temperature from solid phase to liquid phased creased by the dissolution of these phases with improving solid solubility of elements.
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2015, Vol. 22 
