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利用XRD、OM、SEM、TEM测试技术和室温拉伸试验研究均匀化热处理对Mg-7Gd-3Y-1Nd-1Zn-0.5Zr(质量分数,%)合金显微组织及力学性能的影响。结果发现,铸态组织主要由α-Mg、(Mg,Zn)_3RE相和堆垛层错组成,热处理使(Mg,Zn)_3RE部分回溶、晶界附近的堆垛层错消失,但沿着晶界产生了块状14H型长周期堆垛有序(LPSO)相。铸态合金的抗拉强度、屈服强度和伸长率分别为187 MPa、143 MPa和3.1%;而经均匀化热处理后合金的抗拉强度、屈服强度和伸长率分别为229 MPa、132 MPa和7.2%。
The effects of homogenization heat treatment on the microstructure and mechanical properties of Mg-7Gd-3Y-1Nd-1Zn-0.5Zr (mass fraction,%) alloy were investigated by XRD, OM, SEM, TEM and tensile tests at room temperature. The results show that the as-cast microstructure consists mainly of α-Mg, (Mg, Zn) 3 RE phases and stacking faults. The heat treatment causes the (Mg, Zn) 3 RE partially dissolved and the stacking faults near the grain boundaries disappear. The grain boundaries produce massive 14H long period stacking ordered (LPSO) phases. The tensile strength, yield strength and elongation of the as-cast alloys were 187 MPa, 143 MPa and 3.1%, respectively. The tensile strength, yield strength and elongation of the as-cast alloys were 229 MPa, 132 MPa and 7.2% %.