中文摘要：

研究了Al元素对Ti—Si共晶合金显微组织和滑动摩擦学行为的影响．结果表明，添加7．3％的Al改善了铸态合金的微观组织，形成了由近等轴状Ti5Si3颗粒增强α-Ti（Al，Si）固溶相的有利形态．Al的加入可同时提高合金的强度、硬度和塑性，从而有效抑制了磨损亚表层裂纹的生长，在磨损表面产生了具有保护作用的机械混合层，从而显著地提高了合金的耐磨性和摩擦稳定性．

英文摘要：

Ti-Si eutectic alloys with various Al content were fabricated through a vacuum nonconsumable arc melting method. The effect of Al element on the microstructure and tribological behavior of Ti-Si eutectic alloys has been investigated. The results indicate that addition of 7.3% Al improves the microstructure of the as cast alloy in which the α-Ti （Al, Si） solid solution phase is reinforced by the near-equiaxed Ti5Si3 particles. As a result,the strength, hardness and ductility of the alloy are synthetically increased. During the wear process, the growth of cracks is depressed and a protective mechanically mixing layer is formed, on the worn surfaces. The above reasons result in the improvement of wear resistance and tribologieal stability.