延欢欢,侯利锋,卫英慧,范薇,杜华云,郭春丽

• 1:太原理工大学材料科学与工程学院
• 2:吕梁学院

摘要(Abstract)：

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～50μm和50～100μm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。

关键词(KeyWords)： 纯铁;SMAT;Ni;扩散

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51001079,21201129);; 高等学校博士点专项科研基金(20091402110010);; 教育部中国博士后科学基金(20100471586);; 山西省自然科学基金(2011011020-2,2010021023-1)

作者(Author): 延欢欢,侯利锋,卫英慧,范薇,杜华云,郭春丽

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