Effects of ageing treatment on microstructures and properties of Mg–Gd–Y–Zr alloys with and without Zn additions
Effects of ageing treatment on microstructures and properties of Mg–Gd–Y–Zr alloys with and without Zn additions
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DOI：
10.1016/j.jallcom.2007.10.068
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发表时间：
2008-10
影响因子：
6.2
通讯作者：
Xionghua Liu;Rongshi Chen;E. Han
中科院分区：
文献类型：
--
作者：
Xionghua Liu;Rongshi Chen;E. Han
使用光学显微镜、扫描电子显微镜和 X 射线衍射对添加和不添加 1% Zn 的 Mg-10Gd-3Y-0.5Zr 合金进行了研究。比较了两种合金的显微组织、时效硬化行为和力学性能。挤压 T5 样品在 200 至 250°C 的老化过程中表现出显着的时效硬化反应。两种合金在 200°C 时效时获得最高的峰值硬度和强度。在 Mg-10Gd-3Y-0.5Zr 合金中添加 1% Zn，时效效果更显着，力学性能和耐热性也更好。此外，对于 Mg-10Gd-3Y-0.5Zr 和 Mg-10Gd-3Y-1Zn-0.5Zr 合金，在 250°C 初步时效后，在 200°C 进行二次时效。二次时效后的极限拉伸强度值与两种合金的最高强度相比略低，但二次时效提供了高强度和延展性的更好结合。
Mg–10Gd–3Y–0.5Zr alloys with and without 1% Zn additions have been investigated using optical microscopy, scanning electron microscope and X-ray diffraction. The microstructures, ageing hardening behaviors and mechanical properties of the two alloys are compared. The extruded-T5 specimens exhibit remarkable age hardening responses during ageing from 200 to 250°C. The highest peak hardness and strength of the two alloys are obtained when they are aged at 200°C. Addition of 1% Zn to Mg–10Gd–3Y–0.5Zr alloy results in the greater magnitude ageing effect and better mechanical properties as well as better heat resistance. Furthermore, secondary ageing is carried out at 200°C following preliminary ageing at 250°C for both Mg–10Gd–3Y–0.5Zr and Mg–10Gd–3Y–1Zn–0.5Zr alloys. The ultimate tensile strength values after secondary ageing are slightly lower compared with the highest strength of the two alloys, but secondary ageing offers a better combination of high strength and ductility.