(中南工業(yè)大學(xué)粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室， 長(zhǎng)沙 410083)
摘 要: 利用透射電鏡和X射線衍射技術(shù)研究了Mo-36.5 %Si、Mo-45%Si和Mo-66.7%Si混合粉在機(jī)械合金化過(guò)程中的相結(jié)構(gòu)變化。 經(jīng)長(zhǎng)時(shí)間 球磨后，這三種粉都可以轉(zhuǎn)變?yōu)榉蔷В徊煌煞只旌戏鄣闹虚g產(chǎn)物并不相同，中間產(chǎn)物的系非晶轉(zhuǎn)變的機(jī)制不同。Mo-36.5%Si的非晶化過(guò)程是首先形成亞穩(wěn)相的過(guò)飽和固溶體，然后形成了非晶，此時(shí)，Mo和Si原子的尺寸因素是非晶轉(zhuǎn)變的決定因素。Mo-45%Si 和Mo-66.7%Si 混和粉則是首先形成了金屬間化合物，然后形成了非晶相，此時(shí)，缺陷為非晶轉(zhuǎn)變的決定因素。
關(guān)鍵字: 機(jī)械合金化 非晶 金屬間化合物
（Institute of Powder Metallurgy,Central South University of Technology, Changsha 410083, P. R. China）
Abstract:The amorphization of elemental Mo and Si powder upon mechanical alloying(MA) was studied by X-ray diffraction and TEM. After long time grinding, Mo-36.5%Si, Mo-45%Si and Mo-66.7%Si mixture powders could be amorphized, but different powders had different middle products. The difference made the mechanism of amorphization different. First the amorphization procession of Mo-36.5%Si formed super-saturated solid solution, then formed amorphous state. That of Mo-45%Si and Mo-66.7% Si first formed intermetallic compound, then formed amorphous state.
Key words:echanical alloying amorphization intermetallic compound
Key words: echanical alloying amorphization intermetallic compound
