MoSi_2的机械研磨相变

Mechanical milling induced phase of MoSi_2 and its solid-state transition

采用ZJM10T型搅拌球磨机和X射线衍射仪(XRD),研究了机械研磨(MG)条件下MoSi2的同素异构转变及其非晶化,并对其转变机理进行了初步分析和讨论.结果表明,当球料比为10∶1,球磨机转速为450r/min时,MoSi2粉末在机械球磨80h后,没有H MoSi2生成;而当球料比为20∶1,转速为600r/min时,机械球磨60h,已有少量的H MoSi2生成,同时随着球磨时间的增加H MoSi2的量逐渐增加.继续机械研磨,MoSi2合金粉末呈非晶化.试验结果证实相对高的能量有助于MoSi2的固态相变.

Employing a stirringtype ballmill ZJM10T and Xray diffractometer, the isomeric phase transition of MoSi2 and its noncrystallization are investigated by means of mechanical grinding. The mechanism of isomeric transition of MoSi2 at roomtemperature is also analysed and discussed. The result shows that there is no nanocrystallite HHoSi2 to form when the powderball ratio is 10∶1, rotation speed is 450 rpm, and the grinding timeperiod is 80 h; when, however, the parameters abovementioned become 20∶1, 600, and 60 h, respectively, there will be a small amount of HMoSi2 formed; and with increasing the grinding timeperiod, the amount of HMoSi2 will gradually increase and the powder with take the form of noncrystalline. Experimental results verify the fact that relatively high energy is conducive to the solidstate phase transition of MoSi2.