机械合金化制备Mg58Cu42非晶态合金粉末的机理研究

采用X射线衍射和扫描电子显微镜,研究了Mg58Cu42混合粉末在机械合金化过程中的结构和微观形貌变化.结果表明,Mg,Cu粉末在机械合金化过程中是互溶的,机械合金化可以大大提高它们之间的固溶度.球磨过程中,Mg原子逐步溶入Cu基体中,同时,发生晶粒的细化和非晶化过程,并且随着球磨时间的延长,粉末逐渐细化.然后,形成Mg在Cu中的过饱和固溶体;固溶体的变形能量积聚到很大时,发生固溶体晶体结构失稳,最后形成Mg和Cu分布均匀的非晶态合金粉末.

On mechanism of amorphous alloy powder Mg58Cu42 prepared with mechanical alloying

The variation of structure and morphology of Mg_(58)Cu_(42) amorphous powders prepared with mechanical alloying processing are studied by means of XRD and SEM observation. It is shown that powder of Mg and Cu can dissolve into each other and the dissolvability becomes greater after their mechanical alloying (milling). During the milling process,powders of Mg dissolve gradually into the matrix of crystal lattice of Cu and,at the same time, the fining and moncry stalline process of their grains takes place. Further as the time elapses, the size of grain becomes gradually smaller. Then, the supersaturation of Mg in Cu and their solid solution are formed. When the energy of solid solution deformation has accumulated so greatly that the crystalline structure of the solid solution becomes unstable, the amorphous alloy powder with uniformly distributed Mg and Cu is eventually formed. and the amorphous alloy is obtained at the end.