Influence of size and distribution of W phase on strength and ductility of high strength Mg-5.1Zn-3.2Y-0.4Zr-0.4Ca alloy processed by indirect extrusion

查看全文 作　　者：Hansi [1]Jiang;Xiaoguang [1]Qiao;Chao [2]Xu;Shigeharu [2]Kamado;Kun [1]Wu;Mingyi [1]Zheng

机构地区：[1]School of Materials Science and Engineering, Harbin Institute of Technology;[2]Department of Mechanical Engineering, Nagaoka University of Technology

出　　处：《Journal of Materials Science & Technology》索引2018年第34卷第2期,共7页

基　　金：supported financially by the National Key Research and Development Program of China (No. 2016YFB0301102);the National Natural Science Foundation of China (No. 51571068) 摘　　要：A high strength Mg-5.1Zn-3.2Y-0.4Zr-0.4Ca(wt%) alloy containing W phase(Mg_3Y_2Zn_3) prepared by permanent mold direct-chill casting is indirectly extruded at 350?C and 400?C, respectively. The extruded alloys show bimodal grain structure consisting of fine dynamic recrystallized(DRXed) grains and unrecrystallized coarse regions containing fine W phase and β2' precipitates. The fragmented W phase particles induced by extrusion stimulate nucleation of DRXed grains, leading to the formation of fine DRXed grains, which are mainly distributed near the W particle bands along the extrusion direction. The alloy extruded at 350?C exhibits yield strength of 373 MPa, ultimate tensile strength of 403 MPa and elongation to failure of 5.1%. While the alloy extruded at 400?C shows lower yield strength of 332 MPa,ultimate tensile strength of 352 MPa and higher elongation to failure of 12%. The mechanical properties of the as-extruded alloys vary with the distribution and size of W phase. A higher fraction of DRXed grains is obtained due to the homogeneous distribution of micron-scale broken W phase particles in the alloy extruded at 400?C, which can lead to higher ductility. In addition, the nano-scale dynamic W phase precipitates distributed in the un DRXed regions are refined at lower extrusion temperature. The smaller size of nano-scale W phase precipitates leads to a higher fraction of un DRXed regions which contributes to higher strength of the alloy extruded at 350?C. 关键词：挤出温度尺寸变化合金分发韧性间接 nano MPa

相关文献

参考文献（42）
引证文献（3）
耦合文献（19）

参考文献(42)

引证文献(3)

耦合文献(19)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Influence of size and distribution of W phase on strength and ductility of high strength Mg-5.1Zn-3.2Y-0.4Zr-0.4Ca alloy processed by indirect extrusion

参考文献(42)

引证文献(3)

耦合文献(19)

用户提示