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中文摘要：
在纯镁表面机械研磨（SMAT）处理过程中添加Ni3Al粉,研究在剧烈塑形变形和机械应力同时作用时,金属间化合物Ni3Al在镁中的扩散行为。采用金相显微镜、X射线衍射仪和扫描电镜,对研磨处理240 min后纯镁的组织结构、表面合金层的物相组成及合金层的形成机制进行分析。结果表明SMAT处理240 min,可在纯镁表层形成厚度约为20μm的合金层,合金层主要由Mg2Ni金属间化合物组成,该合金层的形成与SMAT过程中纯镁表面晶粒细化,晶界、缺陷增多和体系反应激活能的降低有关。
英文摘要：
During the surface mechanical attrition treatment （SMAT） processing, the Ni3A1 powder was added to the vessel in order to research the diffusion behavior under the coaction of the surface nano-crystallization and mechanical stress. The organizational structure of pure magnesium after SMAT for 240 min, the phase composition and the formation mechanism of alloy layer on coating were systematically analyzed by OM, XRD and SEM. The results show that the homogeneous layer of Mg/Ni alloy with 20 txm depth is formed on the surface of pure magnesium after SMAT for 240min, and the layer is mainly composed of Mg2Ni intermetallic compounds. The formation mechanism is relative to the increment of grain refinement and surface defects, and the reduction of system activation energy in course of SMAT.
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