(中南工业大学粉末冶金国家重点实验室， 长沙 410083)
摘 要: 利用透射电镜和X射线衍射技术研究了Mo-36.5 %Si、Mo-45%Si和Mo-66.7%Si混合粉在机械合金化过程中的相结构变化。 经长时间 球磨后，这三种粉都可以转变为非晶；不同成分混合粉的中间产物并不相同，中间产物的系非晶转变的机制不同。Mo-36.5%Si的非晶化过程是首先形成亚稳相的过饱和固溶体，然后形成了非晶，此时，Mo和Si原子的尺寸因素是非晶转变的决定因素。Mo-45%Si 和Mo-66.7%Si 混和粉则是首先形成了金属间化合物，然后形成了非晶相，此时，缺陷为非晶转变的决定因素。
关键字: 机械合金化 非晶 金属间化合物
（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
