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通过光学显微镜、电子显微镜、差热分析以及抗拉和蠕变性能测试等手段,研究和比较0.6%Ca(质量分数)添加对Mg-3Ce-1.2Mn-0.9Sc和Mg-4Y—1.2Mn-0.9Sc镁合金铸态组织和力学性能的影响。结果表明:添加0.6%Ca能细化Mg-3Ce-1.2Mn-0.9Sc和Mg-4Y。-1.2Mn-0.9Sc合金的晶粒。同时,添加0.6%Ca也能有效改善Mg-3Ce-1.2Mn-0.9Sc和Mg-4Y-1.2Mn-0.9Sc合金的抗拉性能。此外,添加0.6%Ca能改善Mg—3Ce—1.2Mn-0.9Sc合金的蠕变性能,但对Mg-4Y—1.2Mn-0.9Sc合金的蠕变性能是不利的。少量Ca对Mg-3Ce-1.2Mn-0.9Sc和Mg—4Y—1.2Mn-0.9Sc合金蠕变性能的不同影响可能与Ce和Y在Mg中的固溶度存在差异有关。
The effects of 0.6% Ca addition on the microstructure of Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc were studied and compared by means of optical microscope, electron microscope, differential thermal analysis and tensile and creep testing. Effect of 0.9Sc Magnesium Alloy on As - Cast Microstructure and Mechanical Properties. The results show that adding 0.6% Ca can refine Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y. -1.2Mn-0.9Sc alloy grains. At the same time, addition of 0.6% Ca can also effectively improve the tensile properties of Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc alloys. In addition, the addition of 0.6% Ca improves the creep properties of Mg-3Ce-1.2Mn-0.9Sc alloy, but it is unfavorable to the creep property of Mg-4Y-1.2Mn-0.9Sc alloy. The different effects of a small amount of Ca on the creep properties of Mg-3Ce-1.2Mn-0.9Sc and Mg-4Y-1.2Mn-0.9Sc alloys may be related to the differences in the solid solubility of Ce and Y in Mg.