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Novel Mg-Bi-Mn wrought alloys:The effects of extrusion temperature and Mn addition on their microstructures and mechanical properties

查看全文 作　　者：Qinghang [1,2]Wang;Haowei [1]Zhai;Lintao [2]Liu;Hongbo [1]Xia;Bin [2]Jiang;Jun [3]Zhao;Daolun [4]Chen;Fusheng [2]Pan 高影响力作者 机构地区：[1]School of Mechanical Engineering,Yangzhou University,Yangzhou 225127,China;[2]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China;[3]School of Mechanical and Electrical Engineering,Hunan City University,Yiyang 413002,China;[4]Department of Mechanical and Industrial Engineering,Ryerson University,Toronto,ON M5B 2K3,Canada高影响力机构 出　　处：《Journal of Magnesium and Alloys》索引2022年第10卷第9期,共19页高影响力期刊 基　　金：financial support from the National Key Research and Development Program of China(U1764253);the Chongqing Scientific&Technological Talents Program(KJXX2017002)。 摘　　要：Designing and developing the Mg alloys with low cost and high performance is of the great significance.Novel Mg-1Bi-xMn(x=0,1and 2 wt.%)extruded alloys,in this work,were fabricated at different extrusion temperatures(220,250 and 300℃).The effects of extrusion temperature and Mn addition on the microstructures and mechanical properties of extruded alloys at room temperature were investigated.The results showed that decreasing the extrusion temperature could refine the average grain size,weaken the basal fiber texture intensity and improve the microstructural homogeneity of extruded alloys.When the Mn element was added to the Mg-1Bi alloy,the average grain size further reduced.Simultaneously,the number fraction of low angle grain boundaries(LAGBs)increased,along with the occurrence of regions without dynamic recrystallization(unDRX).The combined effects of grain refinement and coarse unDRXed structure made the textures of the extruded Mg-1Bi-xMn alloys never obviously change.Besides few large size un-dissolved second phases,fine Mg_(3)Bi_(2) and α-Mn phases were precipitated in the extruded Mg-1Bi-xMn alloys and partial nano-scaleα-Mn particles pined at grain boundaries(GBs)to effectively impede the migration of GBs for grain refinement.Microstructural variations determined the extruded Mg-1Bi-2Mn alloy to exhibit the highest yield strength of~319.2 MPa with the appropriate elongation-to-failure of~13%at the extrusion temperature of 220℃,and they enabled the extruded Mg-1Bi-1Mn alloy to show the highest elongation-to-failure of~26%without the obvious loss of yield strength of~252.1 MPa. 关 键 词：Mg-Bi-Mn alloys Extrusion temperature Mn addition Microstructure Mechanical property
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