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采用组织分析和拉伸试验,研究了Mg-5Y-3Sm-0.8Ca-(0.1~0.8)Sb(%,质量分数)合金的显微组织和抗拉强度。结果表明,铸态合金的显微组织由α-Mg基体和Mg_(24)Y_5,Mg_(41)Sm_5,Mg_2Ca,Mg_3Sb_2相组成。随着Sb含量的增加,时效态合金的室温(20℃)和高温(200,250,300,350℃)抗拉强度均先升高后降低,且在Sb含量为0.5%时取得最大值。随着温度的升高,Mg-5Y-3Sm-0.8Ca-0.5Sb合金的抗拉强度缓慢降低,其抗拉强度稳定性可归因于强化相Mg24Y5显微硬度的稳定性。
The microstructure and tensile strength of Mg-5Y-3Sm-0.8Ca- (0.1-0.8) Sb (%, mass fraction) alloy were studied by means of microstructure analysis and tensile test. The results show that the microstructure of as-cast alloy is composed of α-Mg matrix and Mg_ (24) Y_5, Mg_ (41) Sm_5, Mg_2Ca and Mg_3Sb_2 phases. With the increase of Sb content, the tensile strength at room temperature (20 ℃) and high temperature (200, 250, 300 and 350 ℃) of the aged alloy firstly increased and then decreased, and the maximum value was obtained when the Sb content was 0.5%. With the increase of temperature, the tensile strength of Mg-5Y-3Sm-0.8Ca-0.5Sb alloy decreases slowly, and its tensile strength stability can be attributed to the stability of microhardness of Mg24Y5.