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研究了不同固溶处理工艺对Mg-2.6Sm-1.3Gd-0.6Zn-0.5Zr合金显微组织和力学性能的影响。合金的铸态显微组织主要由α-Mg和(Mg,Zn)3(Sm,Gd)1共晶相组成。510℃,4 h为最佳固溶处理条件,晶界附近的共晶相几乎全部溶于镁基体中,合金固溶态的室温抗拉强度为246 MPa,延伸率为11.3%。合金200℃时效析出序列为Mgssss→β’’(D019)→β’(bct)→β(fcc),峰时效态合金的屈服强度和抗拉强度达到185 MPa和282 MPa,延伸率为6.1%。
The effects of different solution treatment processes on the microstructure and mechanical properties of Mg-2.6Sm-1.3Gd-0.6Zn-0.5Zr alloy were studied. The as-cast microstructure of the alloy consists mainly of α-Mg and (Mg, Zn) 3 (Sm, Gd) 1 eutectic phases. 510 ℃ for 4 h was the best solution treatment condition. The eutectic phase near the grain boundary almost completely dissolved in the magnesium matrix. The solid solution temperature of the alloy was 246 MPa at room temperature and the elongation was 11.3%. The precipitation aging sequence at 200 ℃ was Mgssss → β ’’ (D019) → β ’(bct) → β (fcc). The yield strength and tensile strength of the alloy reached 185 MPa and 282 MPa, and the elongation was 6.1% .