压力下Ti60Si40纳米晶的固相反应

 利用球磨方法制备出Ti₆₀Si₄₀纳米晶混合物，研究了该混合物在不同静压力下固态反应，利用X射线衍射和电子显微镜分别研究了样品中的相组成。实验结果表明，球磨过程中生成的微量新的亚稳相可以在适当的压力和温度条件下长大，但其长大速率却随压力的增加而减小。在常压下进行相同温度和时间的热处理，则只有纳米晶的长大而没有固相反应发生。

SOLID STATE REACTION IN NANOCRYSTALLINE Ti 60 Si 40 MIXTURE UNDER HIGH PRESSURE

Nanocrystalline mixture of Ti 60 Si 40 was prepared by ball milling and the solid state reactions between Ti and Si have been studied under different pressures. The phase composition of the samples were identified by X ray diffraction and electromicrocopy, The results indicated that the amount of a new phase formed during milling grown up at certain pressure and temperature, while its growth rate decreases with increasing pressure. No reactions occur and only the growth of nanocrystals in the same sample when treated under the same conditions at onrmal pressure.