Microstructures and tensile properties of Mg-Zn-（Gd）-Zr alloys extruded at various temperatures
来源期刊：Rare Metals2017年第12期
论文作者：Xin Qiu Qiang Yang Kai Guan Fanqiang Bu Zhan-Yi Cao Yong-Bing Liu Jian Meng
文章页码：962 - 970
摘 要：The microstructures and tensile properties of Mg-6.0 Zn-0.6 Zr（ZK60） and ZK60 + 1.8 Gd（ZEK620（RE = Gd）） alloys extruded at 290, 305, 320, 340 and360 ℃ were investigated. The results indicate that Gd addition can refine the microstructures of ZK60 alloy and the extrusion parameters such as the extrusion temperature will influence the tensile properties of both as-extruded ZK60 and ZEK620 alloys, although it is much slighter for ZK60 alloy. And the sensitivity is closely related to the textures developed during extrusion. In addition, Gd addition will also clearly improve the tensile strength at room temperature（24 ℃） and particularly at high temperatures（150 and 200 ℃）, due to the much finer grains and smaller intermetallic particles. The highest strength is achieved in the as-extruded ZEK620 alloy with extrusion temperature of 320 ℃, with ultimate tensile strength（UTS） and tensile yield strength（TYS） of 405 and375 MPa, respectively, which are improved by approximately 9% and 11% than those of the as-extruded ZK60 alloy which owns the highest strength at extrusion temperature of 290 ℃.
Xin Qiu1,2，Qiang Yang2，Kai Guan2，Fanqiang Bu2，Zhan-Yi Cao1，Yong-Bing Liu1，Jian Meng2
1. Key Laboratory of Automobile Materials of Ministry of Education,Department of Materials Science and Engineering Jilin University2. State Key Laboratory of Rare Earth Resources Utilization,Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
摘 要：The microstructures and tensile properties of Mg-6.0 Zn-0.6 Zr（ZK60） and ZK60 + 1.8 Gd（ZEK620（RE = Gd）） alloys extruded at 290, 305, 320, 340 and360 ℃ were investigated. The results indicate that Gd addition can refine the microstructures of ZK60 alloy and the extrusion parameters such as the extrusion temperature will influence the tensile properties of both as-extruded ZK60 and ZEK620 alloys, although it is much slighter for ZK60 alloy. And the sensitivity is closely related to the textures developed during extrusion. In addition, Gd addition will also clearly improve the tensile strength at room temperature（24 ℃） and particularly at high temperatures（150 and 200 ℃）, due to the much finer grains and smaller intermetallic particles. The highest strength is achieved in the as-extruded ZEK620 alloy with extrusion temperature of 320 ℃, with ultimate tensile strength（UTS） and tensile yield strength（TYS） of 405 and375 MPa, respectively, which are improved by approximately 9% and 11% than those of the as-extruded ZK60 alloy which owns the highest strength at extrusion temperature of 290 ℃.
关键词：
