Promoting dynamic recrystallization and improving strength and ductility of Mg-7Bi alloy through Al addition

作     者：Gun Woong An Sang-Cheol Jin Hyun Ji Kim Sumi Jo Sung Hyuk Park Gun Woong An;Sang-Cheol Jin;Hyun Ji Kim;Sumi Jo;Sung Hyuk Park

作者机构：Department of Materials Science and Metallurgical EngineeringKyungpook National UniversityDaegu 41566Republic of Korea Graduate School of Materials Science and EngineeringKyungpook National UniversityDaegu 41566Republic of Korea 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2024年第12卷第8期

页      面：3339-3356页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Materials and Components Technology Development Program(No.20024843) funded by the Ministry of Trade,Industry,and Energy(MOTIE,South Korea) the National Research Foundation of Korea(NRF)grant(No.RS-2023-00244478) funded by the Ministry of Science,ICT,and Future Planning(MSIP,South Korea) 

主　　题：Mg-7Bi alloy Al addition Extrusion Recrystallization Microstructure 

摘      要：This study investigated the influence of the addition of Al to a Mg-7Bi(B7,wt%)alloy,particularly its recrystallization behavior during extrusion and its resulting mechanical *** addition of 2 wt%Al to the B7 alloy resulted in a lower grain size,a reduction in the number density of fine Mg3Bi2 particles,and a higher area fraction of relatively coarse Mg3Bi2 particles in the extrusion *** microstructural changes increased the nucleation sites for recrystallization,reduced the Zener pinning effect,and enhanced particle-stimulated nucleation,all of which promoted dynamic recrystallization behavior during *** a result,the area fraction of recrystallized grains in the extruded alloy increased from 77%to 94%.The extruded B7 alloy exhibited a strongfiber texture,whereas the extruded Mg-7Bi-2Al(BA72)alloy had a weak-texture,which was attributed to the minimal presence of unrecrystallized grains and the dispersed orientation of the recrystallized *** tensile yield strength(TYS)of the extruded BA72 alloy was higher than that of the extruded B7 alloy(170 and 124 MPa,respectively),which resulted from the enhanced grain-boundary and solid-solution strengthening *** tensile elongation(EL)of the BA72 alloy also exceeded that of the B7 alloy(20.3%and 6.1%,respectively),the result of the uniform formation of fine twins under tension in the former and the formation of a few coarse twins among the unrecrystallized grains in the ***,the addition of a small amount of Al to the B7 alloy significantly improved both the strength and ductility of the extruded alloy,resulting in a remarkable increase in the product of the TYS and EL from 756 to 3451 MPa%and expanding its potential range of applications as a lightweight extruded structural component.