(*中南工業(yè)大學(xué)材料科學(xué)與工程系，長(zhǎng)沙 410083;
**長(zhǎng)沙鐵道學(xué)院機(jī)電工程學(xué)院，長(zhǎng)沙 410075)
摘 要: 通過(guò)對(duì)Mo、Si混合粉末的機(jī)械球磨，研究了不同球磨條件對(duì)MoSi2形成的影響。 用X射線衍射儀、透射電鏡和掃描電鏡對(duì)不同球磨時(shí)間的粉末進(jìn)行了檢測(cè)與分析， 結(jié)果表明， 在較低球料比的條件下(10∶1)，不同轉(zhuǎn)速的球磨均會(huì)使Si固溶于Mo中， 形成Mo(Si)過(guò)飽和固溶體， 但較低轉(zhuǎn)速(100 r/min)的球磨不能發(fā)生合金化而形成MoSi2， 只有較高轉(zhuǎn)速(225 r/min)的球磨才會(huì)通過(guò)機(jī)械誘發(fā)擴(kuò)散固溶而逐漸形成MoSi2； 在較高球料比的條件下(20∶1)， MoSi2是通過(guò)機(jī)械誘發(fā)自蔓延反應(yīng)而形成的。
關(guān)鍵字: 機(jī)械合金化 二硅化鉬 擴(kuò)散 固溶 自蔓延反應(yīng)
（* 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
