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利用XRD、OM、SEM、EDS、TEM和拉伸性能测试,研究了不同热处理对Mg-5Gd-3Y-0.5Z合金组织和力学性能的影响。结果表明:Mg-5Gd-3Y-0.5Zr合金的铸态组织主要由基体相α-Mg、Mg5Gd和Mg24Y5相组成;经固溶处理后,铸态组织中粗大的析出相基本都溶入α-Mg基体;再经时效处理后,有纳米级别的颗粒状或片状相重新析出。室温条件下,Mg-5Gd-3Y-0.5Zr合金的抗拉强度在T6态达到最大值206.6 MPa。铸态和T6态合金的抗拉强度均随温度的升高,呈现出降低趋势,且下降速度较快;而T4态合金的强度在250℃以前基本保持不变。
The effects of different heat treatments on the microstructure and mechanical properties of Mg-5Gd-3Y-0.5Z alloy were investigated by XRD, OM, SEM, EDS, TEM and tensile testing. The results show that the as-cast microstructure of Mg-5Gd-3Y-0.5Zr alloy is mainly composed of matrix phases α-Mg, Mg5Gd and Mg24Y5. After solution treatment, the coarse precipitates in the as-cast microstructure all dissolve in α- Mg matrix; and then aging treatment, there are nano-level granular or flaky phase re-precipitation. Under room temperature, the tensile strength of Mg-5Gd-3Y-0.5Zr alloy reached the maximum of 206.6 MPa in the T6 state. The tensile strength of as-cast and T6 alloys both decrease with the increase of temperature, and decrease rapidly, while the strength of T4 alloy remains unchanged at 250 ℃.