原位Mg2Si/AM60镁基复合材料半固态流变压铸成形研究
Study on Semi-solid Rheo-die Casting for Mg2Si/AM60 Composites by In-situ Synthesis
吴孝泉1, 闫 洪1, 胡 勇2
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作者单位：1. 南昌大学 先进成形研究所, 江西 南昌 330031; 2. 华东交通大学 机电学院, 江西 南昌 330013
中文关键字：原位合成； 镁基复合材料； 半固态； 流变压铸
英文关键字：in-situ synthesis; magnesium based composites; semi-solid; rheo-die casting
中文摘要：采用原位合成法制备了Mg2Si/AM60镁基复合材料，观察了Mg2Si颗粒的分布情况，并对其半固态流变压铸成形进行了研究。结果表明，Mg2Si颗粒呈汉字状分布；半固态成形减轻了传统压铸件缩孔、偏析等铸造缺陷；液态压铸微观组织基本形貌以大块枝晶为主，液相不规则分布在枝晶间；半固态流变压铸后微观组织绝大部分为球状或类球状组织。
英文摘要：Mg2Si/AM60 composites were prepared by in-situ technique. The distribution of Mg2Si reinforced particles was observed. The forming of rheo-die casting was studied. The results show that, the distribution of Mg2Si particle is in the form of character; the porosity and less segregation in casting of semi-solid formed magnesium alloy composites are improved. The fundamental morphology of the microstructure in conventional die casting is massive dendrite and liquid-phase irregularly distributes between dendrites. The microstructure of the composites after semi-solid rheo-die casting is spherical or as-spherical structure.