采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱分析仪等研究了Mg-Ni样品在球磨过程中的相结构、形貌、微区成分等变化规律,提出了球磨Mg-Ni非晶形成的局部熔化-相互扩散-快速凝固机理:样品在高于一定转速的球磨过程中发生局部熔化,镍粉镶嵌入熔体中,在磨球的撞击作用下,熔体经快速凝固形成成分不均的晶体样品.再次被磨球碰撞时,样品产生局部熔化-相互扩散-快速凝固过程并在界面处形成非晶薄层,随着球磨时间的延长,非晶层的厚度不断增加、样品的微区成分逐渐趋于均匀,原子排列也从长程有序转变为短程有序甚至无序的非晶结构.
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