采用X射线衍射、扫描电镜及透射电镜研究了配比为Mo5-xCoxSi3(x=0.5,1,2)的混合粉末的机械球磨行为.结果表明:随球磨时间延长,混合粉末中首先形成Co,Si在Mo中的过饱和固溶体Mo(Co,Si),高能球磨大大扩展了硅和钴在钼中的固溶度.进一步延长球磨时间,过饱和固溶体转变成为非晶.在球磨过程中,Mo(Co,Si)的晶粒不断细化,球磨至40 h,晶粒尺寸约为8 nm.球磨初期,内应力急剧增加.随球磨时间延长,混合粉末的颗粒尺寸增大,40 h后,逐渐减小,且形状球化,100 h后成为尺寸不超过100 nm的球形粉末.
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