A Comparative Study on the Static Recrystallization Behavior of Cold-Rolled Mg-3Al-1Zn Alloy Stimulated by Electropulse
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TRODUCTION
MG alloys are recognized as a promising structural material to replace steel and Al in the automobile and aerospace industries, owing to their low density and high specific strength.[1,2] Unfortunately, owing to the limitation of the hexagonal close-packed structure, insufficient slip and twinning systems could activate to gain an ideal room-temperature formability, which substantially hinders the widespread application of Mg
XIAOPEI LI is with the Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, The University Town, Room 204, Building J, Shenzhen 518055, P.R. China, and with the School of Materials Science and Engineering, Tsinghua University, Beijing 10084, P.R. China, and also with the Department of Chemistry and Bioengineering, Iwate University, Iwate 020-8550, Japan, XIAOHUI LI is with the Guangdong Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, P.R. China. SONG-ZHU KURE-CHU, is with the Department of Chemistry and Bioengineering, Iwate University, Iwate 020-8550, Japan. GUOYI TANG is with the Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, and also with the School of Materials Science and Engineering, Tsinghua University, Beijing 10084, P.R. China. Contact e-mail: [email protected] Manuscript submitted January 27, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS A
alloys. In addition to poor ductility, Mg alloys also suffer from crystallographic texture during deformation, resulting in strong mechanical anisotropy.[3–8] Taking rolling as an example, as deformation proceeds, most of the c-axes of the grains tend to align parallel to the normal direction (ND) of the sheet; hence, strains along the ND become increasingly hard to accommodate. For decades, various methods have been applied to improve the formability of the alloys based on the two principles of grain refinement and texture modification via recrystallization, including equal channel angular extrusion,[9,10] differential speed rolling,[11,12] accumulative roll bonding,[13] cold working followed by subsequent furnace annealing,[6,14] etc. Although formability may be enhanced by these methods, their applications still suffer from some serious disadvantages related to the complexity of the processes and/or necessary equipment. In addition, adding rare earth (RE) elements to Mg alloys has also been reported to be advantageous for the formability enhancement.[15–19] However, the relatively high cost of RE-containing Mg alloys rather limits their application in industries. In terms of simplifying the processing procedures and facility requirements, the ‘‘rolling + annealing’’ procedure seems to show the most potential. Unfortunately, it has been found that the basal texture of Mg alloys
hardly changes after recrystallization annealing; the basal texture, i.e., the {0001}h1120i texture, is maintained, thereby degrading their formability.[4,20–22] Bhattacharyya et al.[4] found that the basal texture intensity increased with the increasing anne
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