【摘 要】
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The microstructure, tensile properties and fractography of A356 aluminum alloy with As-cast and T6 conditions obtained using expendable pattern shell casting process were investigated.The results show
【出 处】
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2012 Postdoctoral Symposium of China on Materials Science &
论文部分内容阅读
The microstructure, tensile properties and fractography of A356 aluminum alloy with As-cast and T6 conditions obtained using expendable pattern shell casting process were investigated.The results show that the microstructure of A356 aluminum alloy produced by this compound casting process mainly consists of α-Al primary phases, eutectic silicon phases and Mg2Si phases.The eutectic silicon particles are spheroidized and homogeneously distribute in the grain boundary after T6 treatment.The average length, average width and aspect ratio of eutectic silicon particles under T6 condition decrease compared to As-cast condition.The tensile properties including tensile strength, elongation and hardness of A356 aluminum alloy under T6 condition reach 260.53 MPa, 6.15% and 86.0, respectively and have a significant improvement compared to As-cast condition.The fractographs of A356 aluminum alloy tensile samples show a mixed morphology including quasi-cleavage and dimple, and it finally exhibits a transgranular fracture mode.
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