利用Ｘ射线衍射，ＳＥＭ和ＴＥＭ研究了Ｍｏ－Ｓｉ（原子比为１：２）混合粉末在不同球磨条件下的机械合金化过程．Ｍｏ／Ｓｉ相变与球磨强度密切相关，高能球磨有利于稳定相α－ＭｏＳｉ_２的形成，而低能球磨有利于亚稳相β－ＭｏＳｉ_２的形成。对不同球磨条件下的相变动力学和热力学进行了讨论．
The mechanical alloying of Mo-Si powder mixture with atomic ratio of 1:2 under different milling conditions has been studied by means of X-ray diffractometry (XRD), SEM and TEM. It is found that the higher energy milling favours the formation of stable α-MoSi_2, while the lower energy milling promotes the formation of metastable β-MoSi2. Thermodynamics and kinetics aspects related to the different phase transformations have been discussed. Correspondent: QIN Yong,(senior engineer, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031)
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