Improving the room-temperature bendability of Mg-3Al-1Zn alloy sheet by introducing a bimodal microstructure and the texture re-orientation  

作　　者：Chao He Yibing Zhang Ming Yuan Bin Jiang Qinghang Wang Yanfu Chai Guangsheng Huang Dingfei Zhang Fusheng Pan 

机构地区：[1]State Key Laboratory of Mechanical Transmissions,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [2]School of Chemistry and Materials Science,Hubei Engineering University,Xiaogan 432000,China [3]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China [4]School of Mechanical Engineering,Yangzhou University,Yangzhou 225127,China [5]School of Mechanical and Electrical Engineering,Shaoxing University,Shaoxing 312000,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2022年第7期1322-1333,共12页矿物冶金与材料学报（英文版）

基　　金：financial supports from the National Natural Science Foundation of China (Nos.U1764253,51971044,U1910213,52001037,and U207601);Qinghai Scientific&Technological Program (No.2018-GX-A1);Natural Science Foundation of Chongqing (No.c stc2019jcyj-msxmX 0234)

摘　　要：A significant enhancement of bendability was achieved by the introduction of bimodal microstructure for AZ31B alloy sheets via pre-compression and subsequent annealing(PCA)process.This combined treatment led to the c-axis of the extracted samples that were inclined by 30°to the rolling direction(30°sample)further shifting toward the rolling direction(RD)and resulting in a higher Schmid factor(SF)value of basal slip under the RD tensile stress.Furthermore,the bimodal microstructure that was introduced by the PCA process broke the damage bands(DBs)in the initial hot rolled AZ31B alloy sheets and gave rise to a more uniform strain distribution in the outer tension region of the bending samples,in which the tensile deformation was accommodated by the equally distributed{101^(-)2}tension twinning and basal slip.Consequently,the bimodal microstructure,shifted basal texture and the modification of DBs were responsible for the significant enhancement in the bendability of the AZ31 alloys.

关 键 词：magnesium alloy pre-compression TEXTURE bimodal microstructure BENDABILITY 

分 类 号：TG146.22[一般工业技术—材料科学与工程]