(*中南工业大学材料科学与工程系，长沙 410083;
**长沙铁道学院机电工程学院，长沙 410075)
摘 要: 通过对Mo、Si混合粉末的机械球磨，研究了不同球磨条件对MoSi2形成的影响。 用X射线衍射仪、透射电镜和扫描电镜对不同球磨时间的粉末进行了检测与分析， 结果表明， 在较低球料比的条件下(10∶1)，不同转速的球磨均会使Si固溶于Mo中， 形成Mo(Si)过饱和固溶体， 但较低转速(100 r/min)的球磨不能发生合金化而形成MoSi2， 只有较高转速(225 r/min)的球磨才会通过机械诱发扩散固溶而逐渐形成MoSi2； 在较高球料比的条件下(20∶1)， MoSi2是通过机械诱发自蔓延反应而形成的。
关键字: 机械合金化 二硅化钼 扩散 固溶 自蔓延反应
（* Department of Materials Science and Engineering, Central South University of Technology, Changsha 410083, P. R. China
** Electromechamic Engineering College, Changsha Railway University, Changsha 410075, P. R. China）
Abstract:The mixture of Mo and Si powders was milled by mechanical ball milling. The effect of ball milling conditions on the formation of MoSi2 was systematically investigated. The milled powders with various milling times were charactericed by X-ray diffraction, transmission electron microscopy(TEM) and scanning electron microscopy (SEM). The results showed that ball milling results in the supersaturated solid solution of Mo(Si) under combination of low rotation speed and low ball-to-powder mass ratio(10∶1). MoSi2 could only be formed under the condition of high rotation speed(225 r/min). The formation o f MoSi2 during mechanical alloying was characterized by diffusion and solid solution. On the other hand, MoSi2 was formed via the mechanically-induced self-propagating reaction under condition of high ball-to-powder mass ratio(20∶1).
Key words: mechanical alloying MoSi2 diffusion sol id solution self-propagating reaction
