通过重熔化学成分相同的AZ91D压铸件和铸锭,研究了炉料组织对镁合金AZ91D金相形貌、晶粒组织及力学性能的影响.结果表明:与铸锭重熔后相比,压铸件重熔后共晶体的离异程度较大,平均晶粒尺寸较小;经过相同保温时间,压铸件重熔后的抗拉强度、屈服强度及断裂延伸率均较高;随保温时间的延长,两种炉料重熔后的力学性能均得到了提高.采用DTA分析了炉料重熔后的凝固过程,凝固过程中过冷度较小是压铸件重熔后晶粒尺寸小于铸锭重熔后晶粒尺寸的热力学原因.
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