Synergistic effect of low Gd+Mn additions on evolution of microstructure and mechanical properties of Mg−Gd−Mn alloy  

低Gd+Mn添加对Mg-Gd-Mn合金显微组织和力学性能演变的协同作用

作　　者：Dong-dong GU Jian PENG Fu-sheng PAN 古东懂;彭建;潘复生(重庆大学材料科学与工程学院国家镁合金材料工程技术研究中心,重庆400044;井冈山大学机电工程学院,井冈山343009)

机构地区：[1]National Engineering Research Center for Magnesium Alloys,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [2]College of Mechanical and Electrical Engineering,Jinggangshan University,Jinggangshan 343009,China

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第2期431-445,共15页中国有色金属学报(英文版)

基　　金：National Natural Science Foundation of China(No.U2241231);National Key Research and Development Program of China(No.2021YFB3701100);Scientific Research Project of Jiangxi Provincial Department of Education,China(No.GJJ211038);Doctoral Research Project of Jinggangshan University,China(No.JZB2110)。

摘　　要：The synergistic effect of low Gd+Mn additions on the evolution of microstructure and mechanical properties of Mg−xGd−0.8Mn alloy was investigated.Gd addition shows a strong grain refinement effect on the extruded Mg−xGd−0.8Mn alloy,and leads to a continuous decrease in the area fraction of basal texture grains and the corresponding maximum density of texture components.However,the maximum density of the basal texture components grows abruptly as Gd content increases to 6 wt.%.When the Gd content is below 6 wt.%,the asymmetry of the tensile and compressive yield of the alloy is negatively correlated to the Gd content due to grain refinement and texture weakening effects.Besides,the contribution of grain refinement to higher alloy yield strength is more significant than that of grain orientation.Compared with the extruded Mg−xGd alloy,the extruded Mg−xGd−0.8Mn alloy shows a lower limit composition point that corresponds to solid solution strengthening and plasticizing effect(2 wt.%and 4 wt.%).Finally,the trend of basal slip and prismatic slip resistance variations of the extruded Mg−xGd−0.8Mn alloys was predicted.研究低Gd+Mn添加对Mg-x Gd-0.8Mn合金显微组织和力学性能演变的协同作用。Gd添加对挤压态Mgx Gd-0.8Mn合金具有强烈的晶粒细化作用,并导致合金基面织构晶粒的面积分数和相应织构组分的最大密度不断降低。然而,随着Gd含量增加至6%(质量分数),基面织构组分的最大密度急剧增加。当Gd含量低于6%时,由于晶粒细化和织构弱化,合金的拉压屈服不对称性与Gd含量呈负相关。此外,晶粒细化对合金屈服强度提高的贡献比晶粒取向更显著。与挤压态Mg-x Gd合金相比,挤压态Mg-x Gd-0.8Mn合金显示出与固溶强化增塑效应相对应的更低的极限成分点(2%和4%)。最后,预测了挤压态Mg-x Gd-0.8Mn合金基面滑移和柱面滑移阻力的变化趋势。

关 键 词：Mg−Gd−Mn alloy Gd+Mn additions mechanical properties texture evolution solid solution strengthening and plasticizing effect 

分 类 号：TG146.22[一般工业技术—材料科学与工程]