Li_2013_Materials--Design.pdf

Materials and Design 50 (2013) 382–391Contents lists available at SciVerse ScienceDirect Materials and Design journal homepage: www.elsevier .com/locate /matdesDeformation mechanisms and dynamic recrystallization of AZ31 Mg alloy with different initial textures during hot tension0261-3069/$ - see front matter  2013 Elsevier Ltd. All rights reserved. /10.1016/j.matdes.2013.03.028 ? Corresponding author. Address: College of Materials Science and Engineering, Chongqing University, Sha Zheng Jie 174#, Sha Ping Ba District, Chongqing, PR China. Tel.: +86 138 9605 8388; fax: +86 023 6511 1295. E-mail address: qingliu@ (Q. Liu).Nali Li a, Guangjie Huang a, Xiaoyu Zhong a, Qing Liu a,b,? aCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China bNational Engineering Research Centre for Magnesium Alloys, Chongqing University, Chongqing 400044, PR China a r t i c l e i n f o a b s t r a c tArticle history: Received 28 January 2013 Accepted 11 March 2013 Available online 21 March 2013 Keywords: Magnesium alloys Tensile deformation Dynamic recrystallization Initial texture TwinningDeformation mechanisms and dynamic recrystallization (DRX) of AZ31 Mg alloy during tension at a tem- perature of 300 C and strain rate of 5  104 s1 were investigated by using three tension specimens with different initial textures. It is shown that initial texture has a great influence on the twinning behav- ior of the AZ31. A lot of {1012} extension twins were observed in ND specimen, and only a small amount of {1012} extension twins were observed in ND45 specimen, while no twin was observed in RD specimen. The initial texture also affects DRX. If the c-axis is parallel to the tensile axis (TA), as seen in ND specimen, extensive DRX process was observed, and a highest volume fraction of DRX together with a smallest grain size was formed after 45% tension strain before fracture. When the c-axis is inclin- ing 45 or perpendicular to the TA, as seen in ND45