Mechanistic investigation on Ce addition in tuning recrystallization behavior and mechanical property of Mg alloy

作     者：J.R.Li D.S.Xie Z.R.Zeng B.Song H.B.Xie R.S.Pei H.C.Pan Y.P.Ren G.W.Qin J.R.Li;D.S.Xie;Z.R.Zeng;B.Song;H.B.Xie;R.S.Pei;H.C.Pan;Y.P.Ren;G.W.Qin

作者机构：Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)College of Materials Science and EngineeringNortheastern UniversityShenyang110819China College of Engineering and Computer ScienceAustralian National UniversityACT 2601Australia School of Materials and EnergySouthwest UniversityChongqing 400715China Institute for Physical Metallurgy and Materials PhysicsRWTH Aachen UniversityAachen 52062Germany 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2023年第132卷第1期

页      面：1-17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 National Key Research and De-velopment Program of China(No.2021YFB3701002) National Nat-ural Science Foundation of China(No.U2167213,51971053) and funded by the Project of Promoting Talents in Liaoning province(No.XLYC1808038).H.C.Pan acknowledges the financial assistance from Young Elite Scientists Sponsorship Program by CAST(2019-2021QNRC001,2019-2021QNRC002,2019-2021QNRC003) the fund from the Fundamental Research Funds for the Central Univer-sities(N2202020) 

主　　题：Mg alloys Recrystallization behavior Mechanical property Pyramidal dislocation Thermal stability 

摘      要：Constructing bimodal grain structure is a promising approach to achieve the high strength-ductility syn-ergy in Mg *** of bimodal grain is closely related to the dynamic and/or static recrystal-lization process,which has not been fully understood in the typical Mg-RE based *** this work,it is claimed for the first time that the minor Ce addition(∼0.3 wt%)into Mg matrix significantly pro-motes the pyramidaland non-basaldislocations at the early stage of extrusion,which con-sequently enhances the formation of sub-grain boundaries via the movement and recovery of pyramidal II-type*** this stage,fine sub-grain lamellae are widely observed predominantly due to the low migration rate of sub-grain boundary caused by the limited mobility of*** the later stage,the sub-grains continuously transform into dynamic recrystallized(DRXed)grains that have10¯10Taylor axis and also strong fiber texture,indicating substantial activation of pyramidal II-type*** low mobility ofdislocations,accompanied with the solute drag from grain boundary(GB)segregation and pinning from nano-phases,cause a sluggish DRX process and thus a bimodal microstructure with ultra-fined DRXed grains,∼0.51μ*** resultant texture hardening and grain refinement hardening effects,originated from bimodal microstructure,result in a yield strength of∼352 MPa,which is exceptional in Mg-Ce dilute *** work clarifies the critical role of Ce addition in tuning recrystallization behavior and mechanical property of magnesium,and can also shed light on designing the other high-performance Mg alloys.