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采用无压浸渗技术制备Al2O3f/Mg-9Al复合材料,利用金相显微镜、扫描电子显微镜、X射线衍射仪、布氏硬度计,研究了稀土Nd及热处理对复合材料组织和性能的影响。结果表明:在复合材料中添加稀土Nd元素变质处理后,基体合金的显微组织得到明显的细化,同时Mg2Si相的形成和生长得到抑制;热处理后,组织中的灰色Mg2Si相明显增加,呈现均匀分布,-βMg17Al12相在晶界上弥散分布;稀土Nd和热处理对复合材料硬度的提高都有促进作用,添加稀土Nd后复合材料的硬度从133HB增加到150HB,固溶和时效热处理后,复合材料的硬度分别达到232HB、262HB。
Al2O3f / Mg-9Al composites were prepared by pressureless infiltration technique. The effects of rare earth Nd and heat treatment on the microstructure and properties of the composites were investigated by metallographic microscope, scanning electron microscopy, X-ray diffraction and Brinell hardness. The results show that the microstructure of the matrix alloy is obviously refined and the formation and growth of the Mg2Si phase are inhibited after adding the rare earth element Nd in the composite. After the heat treatment, the microstructure of the Mg2Si phase increases obviously, The distribution of -βMg17Al12 phase is dispersed in the grain boundary. The addition of rare earth Nd and heat treatment can promote the increase of the hardness of the composites. The hardness of the composites increases from 133HB to 150HB after Nd addition, and after solution treatment and aging heat treatment, Material hardness reached 232HB, 262HB.