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在原位Mg2Si/Al复合材料中,通过添加稀土Ho、P、混合稀土、Ca对Mg2Si相进行变质(细化)处理,观察变质(细化)前后材料的组织与力学性能变化,确定合适的变质(细化)剂。结果表明:经不同变质剂变质处理后,材料中初生Mg2Si相尺寸都有所减小,变质效果依次为:稀土Ho变质>P和混合稀土复合变质>P或混合稀土单一变质>Ca细化。经稀土Ho变质处理后,初生Mg2Si相转变为不规则的块状或长棒状,共晶Mg2Si变成纤维状,聚集在初生Mg2Si相周围,初生Mg2Si相尺寸达到16μm左右;经稀土Ho处理后,该合金的力学性能有所提升,抗拉强度提升至180 MPa以上,硬度提升至84HB以上。
In the in-situ Mg2Si / Al composite, the microstructure and mechanical properties of the Mg2Si phase were treated by addition of rare earth Ho, P, mixed rare earth and Ca, and the changes of microstructure and mechanical properties before and after the deterioration (refinement) Metamorphic (refined) agents. The results show that the size of primary Mg2Si phase decreases after metamorphic treatment with different metamorphic agents, and the metamorphic effects are as follows: the metamorphic effect of rare earth Ho> P and mixed rare earth compound> P or mixed rare earth single metamorphic> Ca refinement. After rare earth Ho metamorphism treatment, the primary Mg2Si phase transformed into irregular massive or long rod, eutectic Mg2Si becomes fibrous, gathered around the primary Mg2Si phase, primary Mg2Si phase size of about 16μm; rare earth Ho treatment, The mechanical properties of the alloy has improved, tensile strength increased to 180 MPa or more, the hardness increased to 84HB or more.