以纯铁为基体,在表面机械研磨处理(SMAT)过程中加镍粉,处理不同时间后表面形成铁镍合金层.利用OM、XRD、SEM和EDS分析表面合金化层的微观结构、物相组成及元素分布情况.实验结果表明,SMAT处理80、300 min后,纯铁表层分别形成厚度为～ 50 μm和50～100 μm的合金层.SMAT过程中剧烈塑性变形诱导表面形成合金层主要包括粉体嵌入、焊合、粉末和基体细化、扩散.合金层的形成主要与强烈塑性变形作用下,表层晶粒细化导致扩散距离缩短及扩散通道(空位和位错等)增多有关.另外SMAT后纳米晶界具有高的应变能和非平衡状态也会促进元素的扩散,局部升温同样也可以促进元素的扩散.
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