Microstructural evolution and strengthening mechanism of Al–Mg alloys with fine grains processed by accumulative continuous extrusion forming

作     者：Bowei Yang Yu Wang Minqiang Gao Changfeng Wang Renguo Guan Bowei Yang;Yu Wang;Minqiang Gao;Changfeng Wang;Renguo Guan

作者机构：School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Key Laboratory of Near-Net Forming of Light Metals of Liaoning ProvinceDalian Jiaotong UniversityDalian 116028China Engineering Research Center of Continuous ExtrusionMinistry of EducationDalian Jiaotong UniversityDalian 116028China 

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

年 卷 期：2022年第128卷第33期

页      面：195-204页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Key Research and Development Program of China[No.2018YFB2001800] the National Natural Science Foundation of China(No.51871184) the Dalian High-level Talents Innovation Support Program(No.2021RD06) the Dongguan Graduate Workstation Project(No.20201900300032) 

主　　题：Al-Mg alloy Grain refinement Mechanical property Dynamic recrystallization Strengthening mechanism 

摘      要：In this work,the mechanical properties and strengthening mechanisms induced by microstructural evolution in a rheo-extruded 5087 alloy processed via accumulative continuous extrusion forming(ACEF)were *** back-scattered diffraction(EBSD)and transmission electron microscopy(TEM)were utilized to characterize the microstructure of the alloy subjected to ACEF with various *** grain refinement caused by continuous dynamic recrystallization(CDRX)was *** results demonstrated that after 3 passes of ACEF,there was a significant grain refinement effect on the alloy,and the average grain size decreased from 45.6μm to 2.5μm;the ultimate tensile strength(UTS)and yield strength(YS)of the alloy increased to 362.8 MPa and 234.6 MPa,*** cells/walls generated during deformation promoted the formation of low angle grain boundaries(LAGBs).The accumulative strain accelerated the transformation of LAGBs to high angle grain boundaries(HAGBs).Dislocation pile-up enhanced the driving force of CDRX,and nano-sized Al_6(Mn,Fe)phases at the grain boundaries inhibited the growth of grains due to the pinning *** on the quantitative estimation,dislocation strengthening and grain boundary strengthening dominated the enhancement in YS of the ACEFed alloy.