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本文提出了通过基体合金化改良Ａｌ２Ｏ３/Ａｌ界面润湿的思路．添加元素Ｍ必须满足以下两个条件:(１)液态金属表面能γＭ＜γＡｌ;(２)氧化物Ｇｉｂｂｓ形成能△ＧＭｘＯｙ＜△ＧＡｌ２Ｏ３,并在实验中得到验证．Ｍｇ是良好的润湿增强剂．而且随Ｍｇ含量的增加,浸润效果增强．Ｂｉ、Ｐｂ和Ｌｉ合金化在Ｍｇ的基础上进一步加强润湿、但Ｃｕ的加入效果相反．在Ａｌ２Ｏ３/６０６１Ａｌ复合材料中,Ｍｇ偏析到界面．且在一定条件下生成界面反应产物ＭｇＡｌ２Ｏ４,但是在Ａｌ２Ｏ３/６２６２Ａｌ复合材料中富集Ｂｉ和Ｐｂ的纳米颗粒存在于增强体之间或增强体内部孔隙．讨论了０．５μｍ或４μｍ Ａｌ２Ｏ３/６０６１Ａｌ和４μｍＡｌ２Ｏ３/６２６２Ａｌ复合材料的力学性能与微观结构．
This paper presents the idea of improving the wetting of Al2O3 / Al interface by matrix alloying. The addition of element M must meet the following two conditions: (1) liquid metal surface energy γM <γAl; (2) oxide Gibbs formation energy △ GMxOy <△ GAl2O3, and verified in the experiment. Mg is a good wetting enhancer. And with the increase of Mg content, infiltration effect is enhanced. Bi, Pb and Li alloying further strengthen the wetting on the basis of Mg, but the addition of Cu has the opposite effect. In Al2O3 / 6061Al composites, Mg segregates to the interface. And the interface reaction product MgAl2O4 was formed under certain conditions. However, the nanoparticles enriched in Bi and Pb in the Al2O3 / 6262Al composite existed between the reinforcements or enhance the pores in the body. The mechanical properties and microstructure of 0.5μm or 4μm Al2O3 / 6061Al and 4μm Al2O3 / 6262Al composites were discussed.