混合稀土对ZM5镁合金氧化行为和性能的影响
Effect of Adding RE on Oxidation Behavior and Performance of ZM5 Alloy
李华基, 饶劲松, 薛寒松
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作者单位：重庆大学 材料科学与工程学院, 重庆 400030
中文关键字：混合稀土； 镁合金； 氧化行为； 性能
英文关键字：mixed rare earth; magnesium alloy; oxidation behavior; performance
中文摘要：为提高ZM5镁合金阻燃性能，在其中添加了0.1wt%的混合稀土(RE)。通过分析该合金的氧化增重TGA曲线、热量变化DSC曲线和表面氧化膜的XRD谱、SEM图像及膜内元素分布，对其表面氧化行为进行了研究，并对力学性能和切削阻燃效果进行了研究。结果表明，添加0.1wt%RE能显著提高ZM5合金的抗氧化性能，在连续升温过程中氧化增重主要发生在500～700 ℃， 生成的保护性氧化膜主要由RE2O3、MgO、Al2O3和Mg17Al12组成，厚度为2.5～3.5 μm，合金力学性能和切削阻燃效果均得到显著改善。
英文摘要：0.1wt% mixed rare earth (RE) was added into ZM5 alloy to improve its ignition-proof performance. The TGA curve, DSC curve, oxidation kinetics curves of the alloy and the XRD spectrum, SEM image, element distribution on the surface film were analyzed in order to investigate the surface oxidation behavior. The mechanical performance and ignition-proof effect during cutting process were also tested. The results show that adding 0.1%RE to ZM5 alloy can improve its anti-oxidation performance, and the oxide increment occurs mostly between 500 ℃ and 700 ℃, and the thickness of protective oxidation film, which mainly consists of RE2O3, MgO, Al2O3 and Mg17Al12, is 2.5～3.5 μm. The mechanical performance and ignition-proof effect during cutting process improve obviously.