Tailoring Texture to Highly Strengthen AZ31 Alloy Plate in the Thickness Direction via Pre-tension and Rolling-Annealing  

作　　者：Tianjiao Li Jiang Zheng Lihong Xia Haoge Shou Yongfa Zhang Rong Shi Liuyong He Wenkai Li 

机构地区：[1]International Joint Laboratory for Light Alloys(Ministry of Education),College of Materials Science and Engineering,Chongqing University,Chongqing,400044,China [2]Shenyang National Laboratory for Materials Science,Chongqing University,Chongqing,400044,China [3]College of Mechanical Engineering,Chongqing Technology and Business University,Chongqing,400067,China [4]Zhejiang Provincial Engineering Center of Integrated Manufacturing Technology and Intelligent Equipment,Zhejiang University City College,Hangzhou,310015,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2023年第2期266-280,共15页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51575068 and 51501023);the State Key Research and Development Program of MOST,China(No.2016627 YFB0701204);the Fundamental Research Funds for the Central Universities(No.2020CDJDPT001);the Chongqing Natural Science Foundation(Nos.cstc2018jcyjAX0364 and cstc2021jcyj-msxmX0699);the“111”Project of the Ministry of Education(No.B16007).

摘　　要：Conventional wrought Mg alloys,such as AZ31 and ZK60 rolled plates,usually exhibit significantly low tensile yield strength in the thickness direction.This can be attributed to the high activity of{10-12}tension twinning due to the strong basal texture(<0001>//ND,normal direction).In this work,the tensile yield strength in the ND of the as-rolled(AR)AZ31 plate increased from 50 to 150 MPa(increased by 200%)via simple processing,i.e.,pre-tension and rolling-annealing(PTRA)treatment.The strong basal texture(<0001>//ND)of the AR plate was changed into a weakened fiber texture(<0001>⊥ND).The evolution of microstructures during PTRA treatment and the activated deformation modes during uniaxial tension were studied quantitatively and statistically by the means of intergranular misorientation(IM)and in-grain misorientation axes(IGMA)analysis.The results indicate that various twin variants,as well as{10-12}-{10-12}secondary twins,were activated during pre-tension and rolling,and most residual matrix was consumed by twins after annealing.The dominated deformation modes in tension changed from{10-12}tension twinning(the AR sample)to prismatic slip(the PTRA sample)in the early tensile deformation.The underlying formation mechanism of the fiber texture and corresponding strengthening mechanism were discussed.

关 键 词：PRE-TENSION ANNEALING Tailoring texture Texture strengthening Deformation modes 

分 类 号：TG146.22[一般工业技术—材料科学与工程]