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选用强流脉冲电子束对AZ31镁合金进行表面改性处理,分析了改性后的AZ31镁合金表面显微结构,测量处理前后AZ31镁合金的耐磨性能和耐蚀性能。结果表明,脉冲电子束处理后AZ31合金表面出现了典型的熔坑形貌,同时熔坑周围有应力波作用产生的褶痕。由电子束快速凝固作用所产生的表层晶粒细化和固溶强化显著提高了AZ31合金的耐磨性。此外,电子束表面改性导致表层镁、铝元素含量及分布形式发生变化。样品表层铝元素的升高是改善其腐蚀性能的主要原因。
The surface of AZ31 magnesium alloy was modified by pulsed electron beam. The microstructure of AZ31 magnesium alloy was analyzed. The wear resistance and corrosion resistance of AZ31 magnesium alloy were measured before and after treatment. The results show that the typical crater morphology appears on the surface of AZ31 alloy after pulse electron beam treatment, and the crease generated by the stress wave around the crater has been observed. The surface grain refinement and solid solution strengthening produced by the rapid solidification of the electron beam significantly improve the wear resistance of the AZ31 alloy. In addition, the electron beam surface modification leads to changes in the surface magnesium and aluminum content and distribution. The increase of aluminum in the sample surface is the main reason to improve its corrosion performance.