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采用光学显微镜、扫描电镜、X射线衍射仪和万能力学试验机等研究了固溶和时效热处理对Mg-12Gd-Y-0.5Zr合金显微组织和力学性能的影响。结果表明:Mg-12Gd-Y-0.5Zr合金铸态组织主要由α-Mg基体和沿晶界呈不连续网状分布的Mg_5(Gd,Y)共晶相组成,经固溶时效处理后,合金组织主要由分布于晶粒内部和晶界处的颗粒状Mg_5Gd、Mg_(24)Y_5相组成,有效地提高了合金强度。在不同状态下合金的室温抗拉强度为:铸态191.5 MPa、固溶态213.6 MPa以及时效态269.7 MPa。经固溶时效处理后,塑性有明显的改善。
The effects of solution heat treatment and aging heat treatment on the microstructure and mechanical properties of Mg-12Gd-Y-0.5Zr alloy were investigated by optical microscope, scanning electron microscopy, X-ray diffraction and universal mechanical testing machine. The results show that the as-cast microstructure of Mg-12Gd-Y-0.5Zr alloy mainly consists of α-Mg matrix and Mg_5 (Gd, Y) eutectic phase with discontinuous network distribution along the grain boundaries. The microstructure of the alloy mainly consists of the granular Mg_5Gd and Mg_ (24) Y_5 phases distributed in the grain boundaries and grain boundaries, which effectively improves the strength of the alloy. Under different conditions, the room temperature tensile strength of alloy is: as-cast 191.5 MPa, solid solution state 213.6 MPa and aging state 269.7 MPa. After solution treatment aging, plastic significantly improved.