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采用原位反应法制备了20Mg_2Si/Al-Si复合材料,研究了P对该复合材料微观组织和力学性能的影响。结果发现,未添加P时,复合材料中的初生Mg_2Si相呈现出粗大的树枝晶和多边形块状;当加入P后,初生Mg_2Si相转变为细小的颗粒状,其实质是P与Al形成了AlP化合物,并充当了初生Mg_2Si相的异质形核核心。未变质时,复合材料的硬度(HB)和抗拉强度约为71.5和102.1 MPa,而加入P后,复合材料的硬度(HB)和抗拉强度分别增加至97.2和133.6 MPa。
In situ reaction was used to prepare 20Mg_2Si / Al-Si composites. The effects of P on the microstructure and mechanical properties of the composites were investigated. The results showed that the primary Mg 2 Si phase in the composite showed coarse dendrites and polygonal lumps without addition of P, and the primary Mg 2 Si phase transformed into fine granular form when P was added. In essence, P and Al formed AlP Compounds, and act as a heterogeneous nucleation center of the primary Mg 2 Si phase. The hardness (HB) and tensile strength of the composites were about 71.5 and 102.1 MPa, respectively. The hardness (HB) and tensile strength of the composites increased to 97.2 and 133.6 MPa, respectively.