Grain refining and improving mechanical properties of AZ31 Mg alloy sheets by multi-pass warm rolling with falling tempe
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ARTICLE Grain refining and improving mechanical properties of AZ31 Mg alloy sheets by multi-pass warm rolling with falling temperature Yanchun Zhao Department of Materials Science and Engineering, Yangze Normal University, Chongqing 408100, China
Hua Zhang,a) Jianfeng Fan, Lifei Wang, and Qiang Zhang Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
Cheng Peng Department of Materials Science and Engineering, Yangze Normal University, Chongqing 408100, China
Hongbiao Dong Department of Engineering, University of Leicester, Leicester LE1 7RH, U.K.
Bingshe Xu Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China (Received 20 May 2018; accepted 30 July 2018)
Multi-pass warm rolling with falling temperature was proposed and investigated to obtain AZ31 Mg alloy sheets with a fine-grained microstructure. The results indicated that the grain microstructure of AZ31 alloy sheets was successfully refined from 22.1 to 4.5 lm after multi-pass warm rolling with falling temperature and annealing. Compared to the as-received sheet, the multi-pass warm rolled sheets in annealed condition exhibited weaker (0001) basal texture intensity, which resulted in the significantly increased Schmid factor of hai basal slip. After multi-pass warm rolling with falling temperature, the rolled sheets in annealed condition also exhibited much better mechanical properties, e.g., higher tensile strength, larger fracture elongation, and higher Erichsen value, especially the IE of 8-pass warm rolled sheet in annealed condition was significantly increased by ;33% under the same thickness, which could be attributed to the refined grain microstructure and the weakened basal texture.
I. INTRODUCTION
Magnesium (Mg) and its alloys have promising potential application in the fields of aerospace, automotive, and electronic communication technologies due to their low density, high specific strength, high specific stiffness, high electromagnetic shielding, and so on.1,2 However, Mg alloys exhibit low strength and ductility because of their hexagonal close packed crystal structure, where limited independent slip systems could be activated at low temperature.3 Therefore, their wide applications are limited to a great extent. To overcome these defects to improve their mechanical properties at room temperature, extensive efforts are being devoted to microstructural controlling, such as improving texture and grain refinement.4–6 A strong (0001) basal texture is usually formed in the traditional rolled or extruded Mg alloys,7,8 which induces a larger anisotropy and thus deteriorates the stamping a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2018.292 J. Mater. Res., 2018
formability.9 Iwanaga et al.10
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