Microstructures and strengthening mechanisms of Mg-8.2Gd-4.6Y-1.5Zn-0.4Zr alloy containing LPSO,β’ and γ type phases
来源期刊：JOURNAL OF RARE EARTHS2020年第10期
论文作者：Xiangsheng Xia Kui Zhang Minglong Ma Ting Li
文章页码：1119 - 1125
摘 要：The microstructures and strengthening mechanisms of the Mg-8.2 Gd-4.6 Y-1.5 Zn-0.4 Zr（wt%） alloy with long-period stacking ordered（LPSO）,β’ and γ type phases were systematically studied.The results show that the LPSO with lamellar and block structures forms near the grain boundaries.The grains are clearly refined,and the 18 R LPSO phase is oriented along the extrusion direction after extrusion.Some particles also precipitate from the Mg matrix dynamically.The extruded alloy exhibits a remarkable agehardening response,and mechanical properties,with a tensile strength（TS） of 449 MPa,yield strength（YS） of 362 MPa,and elongation of 7.9% obtained in the peak-aged alloy.The strengthening mechanisms of the alloy in different states are discussed.Grain boundary and precipitation strengthening are the main strengthening mechanisms for the peak-aged alloy.
Xiangsheng Xia1,2,3,4，Kui Zhang1,2,3，Minglong Ma1,2,3，Ting Li5
1. State Key Laboratory of Non-Ferrous Metals and Processes,GRINM Co.,Ltd3. General Research Institute for Non-Ferrous Metals4. Southwest Technology and Engineering Research Institute5. National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials,China United Test & Certification Co.,Ltd.,GRINM Group Co.,Ltd.
摘 要：The microstructures and strengthening mechanisms of the Mg-8.2 Gd-4.6 Y-1.5 Zn-0.4 Zr（wt%） alloy with long-period stacking ordered（LPSO）,β’ and γ type phases were systematically studied.The results show that the LPSO with lamellar and block structures forms near the grain boundaries.The grains are clearly refined,and the 18 R LPSO phase is oriented along the extrusion direction after extrusion.Some particles also precipitate from the Mg matrix dynamically.The extruded alloy exhibits a remarkable agehardening response,and mechanical properties,with a tensile strength（TS） of 449 MPa,yield strength（YS） of 362 MPa,and elongation of 7.9% obtained in the peak-aged alloy.The strengthening mechanisms of the alloy in different states are discussed.Grain boundary and precipitation strengthening are the main strengthening mechanisms for the peak-aged alloy.
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