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利用X射线衍射仪、光学显微镜、扫描电镜和精密万能电子拉伸试验机对铸态、时效态高强耐热Mg-12Gd-5Y-1Sm-0.5Zr(wt%)合金的显微组织和力学性能进行了研究。结果表明,合金的铸态组织主要由α-Mg固溶体和沿晶界分布的树枝状的第二相组成,经固溶时效处理后,晶界隐约可见,沿晶界仍有部分第二相析出,晶内有弥散分布的析出相产生。时效态合金的室温(25℃)和高温(200、250和300℃)抗拉强度先升高后降低,在250℃达到最大值243 MPa。
The microstructure and mechanical properties of as-cast and aging high-strength and heat-resistant Mg-12Gd-5Y-1Sm-0.5Zr (wt%) alloys were characterized by X-ray diffraction, optical microscopy, scanning electron microscopy and precision universal tensile testing machine Were studied. The results show that the as-cast microstructure of the alloy mainly consists of α-Mg solid solution and the dendritic second phase distributed along the grain boundary. After solution aging treatment, the grain boundaries are vaguely visible and some second phases are precipitated along the grain boundaries , There is a dispersed precipitation within the crystal precipitation. The tensile strength of aged alloys at room temperature (25 ℃) and high temperature (200, 250 and 300 ℃) first increases and then decreases, reaching the maximum of 243 MPa at 250 ℃.