Microstructure and Texture Evolution of Magnesium Alloys During Electropulse Treatment
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INTRODUCTION
MAGNESIUM alloy has long been regarded as a promising candidate for replacing its steel and aluminum counterparts in automobile industry due to its low density and high specific strength. Unfortunately, the poor room temperature formability, resulted from the hexagonal crystal structure and strong crystallographic texture, greatly hinders the uptake of the alloy into application. For decades, much effort has been made to improve the ductility of the alloy via grain refinement and texture modification. Special processing techniques, such as single roller drive rolling (SRDR),[1] differential speed rolling (DSR),[2] equal channel angular extrusion (ECAE),[3,4] and pre-rolling along the transverse direction,[5] have recently been investigated by researchers. However, despite their potential for grain refinement and texture modification, further application of these JIE KUANG, Ph.D. Candidate, and GUOYI TANG, Professor, are with the Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, The University Town, Room 204, Building J, Shenzhen 518055, P.R. China, and also with the Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P.R. China. Contact e-mail: [email protected] XIAOHUI LI, Post-Doctoral, is with the Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, and also Associate Professor with the Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510651, P.R. China. XIAOXIN YE, Ph.D. Candidate, and HAIFENG LIU, Engineer, are with the Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University. JIANGUO TANG, Associate Professor, is with the School of Materials Science and Engineering, Central South University, Changsha 410083, P.R. China. JEFF WANG, Research Scientist, formerly with the General Motors China Science Lab, Shanghai 201206, P.R. China, is now with the General Motors, Warren, MI 48090. Manuscript submitted September 24, 2014. METALLURGICAL AND MATERIALS TRANSACTIONS A
techniques is restricted due to limited industrial scalability. Considering the fact that ‘Rolling/Extrusion + Annealing’ prevails in the current manufacture of magnesium alloys of technical and scientific interest is the research on the recrystallization behavior (dynamic, meta-dynamic, or static) of the alloy. Over the last decade, while a wide range of processing and annealing parameters have been explored in various magnesium alloys, no dramatic change in the textures of conventional wrought magnesium alloys has been reported.[6,7] In recent years, Mg alloys containing rare earth (RE) elements have attracted a lot of attention.[8–14] Although it is widely accepted that the addition of RE can improve the formability via texture modification, the underlying mechanism by which RE elements weaken the recrystallization texture is still the subject of much debate. Scientists were inclined to understand the effect of RE elements based on two conventional aspects
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