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以Mg-6Al-XCa-XNd合金为研究对象,采用金相组织观察、SEM、室温和高温拉伸实验以及断口组织观察等分析测试手段,研究了Ca和Nd元素含量对Mg-6Al-XCa-XNd合金微观组织和力学性能的影响规律。结果表明,随着Ca和Nd元素含量增加,Mg-6Al-XCa-XNd合金晶粒尺寸减小,Mg-6Al-3Ca-3Nd和Mg-6Al-4Ca-4Nd合金的铸态组织呈蔷薇状;Mg-6Al-XCa-XNd合金的室温拉伸强度和延伸率降低,Mg-6Al-XCa-XNd合金的175℃高温拉伸强度先增加后降低,延伸率降低。Mg-6Al-3Ca-3Nd合金的175℃高温拉伸强度值可达到141.42 MPa。室温拉伸断口表面与高温拉伸断口表面相比存在较多的微观裂纹。
The effects of Ca and Nd contents on the microstructures of Mg-6Al-XCa-XNd alloy were studied by means of metallographic observation, SEM, tensile test at room temperature and high temperature and fracture microstructure analysis. XNd alloy microstructure and mechanical properties of the law. The results show that as the content of Ca and Nd increases, the grain size of Mg-6Al-XCa-XNd alloy decreases and the as-cast microstructure of Mg-6Al-3Ca-3Nd and Mg-6Al-4Ca- The tensile strength and elongation of Mg-6Al-XCa-XNd alloy decreased at room temperature. The tensile strength at 175 ℃ of Mg-6Al-XCa-XNd alloy first increased and then decreased, while the elongation decreased. The tensile strength at 175 ℃ of Mg-6Al-3Ca-3Nd alloy reaches 141.42 MPa. Tensile fracture surface at room temperature compared with high temperature tensile fracture surface there are more micro-cracks.