Unveiling the planar deformation mechanisms for improved formability in pre-twinned AZ31 Mg alloy sheet at warm temperature  

作　　者：Xiaohuan Pan Lifei Wang Pengbin Lu Hua Zhang Guangsheng Huang Liuwei Zheng Bin Xing Weili Cheng Hongxia Wang Wei Liang Kwang Seon Shin 

机构地区：[1]Shanxi Key Laboratory of Advanced Magnesium-Based Materials,College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [2]National Engineering Laboratory for Industrial Big-data Application Technology,Chongqing Innovation Center of Industrial Big-Data Co.Ltd.,Chongqing 400707,China [3]School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [4]Institute for Advanced Studies in Precision Materials,Yantai University,Yantai 264005,China [5]National Engineering Research Center for Magnesium Alloys,College of Materials Science&Engineering,Chongqing University,Chongqing 400044,China [6]Magnesium Technology Innovation Center,School of Materials Science and Engineering,Seoul National University,1 Gwanak-ro,Gwanak-gu,Seoul 08826,South Korea

出　　处：《Journal of Magnesium and Alloys》2023年第12期4659-4678,共20页镁合金学报(英文)

基　　金：the Central Government Guided Local Science and Technology Development Projects(YDZJSX2021A010);China Postdoctoral Science Foundation(No.2022M710541);the National Natural Science Foundation of China(51704209,52274397,U1810208);the Projects of International Cooperation in Shanxi(201803D421086);Shanxi Province Patent Promotion Implementation Fund(20200718);Research Project Supported by Shanxi Scholarship Council of China(2022-038);Science and Technology Major Project of Shanxi Province(20191102008,20191102007,20181101008);Taishan Scholars Project Special Fund(2021)。

摘　　要：To investigate the role of pre-twins in Mg alloy sheets during warm planar deformation,the stretch forming is conducted at 200℃.Results suggest the formability of the pre-twinned AZ31 Mg alloy sheet is enhanced to 11.30 mm.The mechanisms for the improved formability and the deformation behaviors during the planar stretch forming are systematically investigated based on the planar stress states.The Schmid factor for deformation mechanisms are calculated,the results reveal that planar stress states extremely affect the Schmid factor for{10-12}twinning.The detwinning is activated and the prismatic slip is enhanced in the pre-twinned sheet,especially under the planar extension stress state in the outer region.Consequently,the thickness-direction strain is accommodated better.The dynamic recrystallization(DRX)type is continuous DRX(CDRX)regardless of the planar stress state.However,the CDRX degree is greater under the planar extension stress state.Some twin lattices deviate from the perfect{10-12}twinning relation due to the planar compression stress state and the CDRX.The basal texture is weakened when the planar stress state tends to change the texture components.

关 键 词：AZ31 Mg alloy sheet Planar stretch forming Planar stress states Continuous dynamic recrystallization {10-12}tensile twinning 

分 类 号：TG146.22[一般工业技术—材料科学与工程]