(上海交通大學(xué)金屬基復(fù)合材料國家重點實驗室，上海 200030)
摘 要: 從熱力學(xué)角度分析了SiC晶須與Mg-Li-Al合金的化學(xué)相容性，利用透射電鏡及高分辨電鏡研究了SiCw/MgLiAl復(fù)合材料的界面結(jié)構(gòu)，并測試了復(fù)合材料的力學(xué)性能。結(jié)果表明，該復(fù)合體系化學(xué)相容性較好， SiC晶須與基體合金界面結(jié)合緊密，沒有反應(yīng)物；少數(shù)SiC 晶須表面發(fā)生了沿{111}晶面的定向損傷，出現(xiàn)了70.5°或109.5°臺階。拉伸實驗結(jié)果表明，SiC晶須對Mg-Li-Al合金具有明顯的強化作用，使復(fù)合材料的抗拉強度、彈性模量明顯提高。
關(guān)鍵字: SiCw/MgLiAl復(fù)合材料；界面結(jié)構(gòu)；力學(xué)性能
（State Key Lab of MMCs, Shanghai Jiao Tong University, Shanghai 200030, P.R.China）
Abstract:The chemical compatibility, interfacial structure and tensile properties of SiCw/MgLiAl composites were studied. The results showed that the thermodynamic potential for the reaction between the matrix and SiC whiskers is very low. There is a good connection between the Mg-Li-Al matrix and SiC whiskers. No compound was found on the interface of the composites. However, some whiskers were invaded in the direction {111}. As a result, stages with 70.5° or 109.5° angles were formed on the surface of SiC whiskers. Tensile test confirmed that the tensile strength of SiCw/MgLi8Al1 composites was increased by nearly 50%, in compared with the matrix alloy.
Key words: SiCw/MgLiAl composites; interfacial structure; mechanical properties
