原位内生Al/Mg_2Si/Si复合材料铸态组织研究  

ON THE MICROSTRUCTURE OF AN AS CAST Al/Mg_2Si/Si IN SITU COMPOSITE

作　　者：张健[1] 王玉庆[1] 杨滨[1] 周本濂[1,2] 

机构地区：[1]中国科学院金属研究所五室 [2]中国科学院国际材料物理中心,沈阳110015

出　　处：《复合材料学报》1999年第4期30-34,共5页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金

摘　　要：利用普通重力铸造方法， 制备了原位内生Ａｌ／Ｍｇ２Ｓｉ／Ｓｉ复合材料。研究了体系中加入过量Ｓｉ后的显微组织， 并利用Ａｌ－Ｍｇ２Ｓｉ－Ｓｉ三元相图进行分析。结果表明， 过量Ｓｉ使复合材料中的大长径比的Ａｌ＋ Ｍｇ２Ｓｉ二元共晶向小长径比的Ａｌ＋ Ｍｇ２Ｓｉ＋ Ｓｉ三元共晶转化， 并使α－Ａｌ以球状晶粒析出， 从而改善了显微组织， 显著提高了复合材料的室温拉伸性能。In situ Al/Mg 2Si/Si composites were fabricated by using simple weight cast technique. Effects of extra Si contents on microstructure of Al/Mg 2Si composite were investigated by optical microscopy and SEM with an EDXA accessory. Al Mg 2Si Si ternary diagram was also introduced to analyze the microstructure. Experimental results indicated that extra Si in Al/Mg 2Si system produced sphere like α Al grains and ternary eutectics with low aspect ratio. These microstructure improvements resulted in a significant increase in the materials' tensile properties.

关 键 词：原位内生 复合材料 显微组织 铸态 铝/硅化镁 

分 类 号：TB331[一般工业技术—材料科学与工程]