期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 34, 期 11, 页码 2069-2083出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2018.04.005
关键词
Pre-vertical compression; Shear bands; Tensile twins; Dynamic recrystallization; Tensile anisotropy
资金
- National Key Research and Development Program of China [2016YFB0301104]
- National Natural Science Foundation of China [51771043]
Mg alloy AZ31B plates were processed by hot rolling with different thickness reductions per pass and prevesical compression followed by super-high reduction hot rolling (PVCR), respectively. Microstructure evolution, rolling formability variation and mechanical responses were investigated. As reduction per pass increased, the number of shear bands deflecting toward rolling direction increased, resulting in easy crack initiation in and around the bands. With increasing reduction per pass up to 80%, twinning and twinning-induced dynamic recrystallization (DRX) dominated the deformation of the edge material at 350 degrees C, resulting in local recrystallization with coarse grains and further largest edge-crack degree. Pre-induced {1012} tensile twins by pre-vertical compression (PVC) increased number density of nucleationsites for dynamic recrystallization during the subsequent severe rolling, which enhanced the dominant role of continuous dynamic recrystallization. Designed PVCR-b was proved to be a relatively effective method to improve rolling formability of rolled Mg alloy AZ31B plates. With this method, mean grain size of AZ31B plate was significantly refined from similar to 600mm to similar to 14.1 mm and more homogeneous grain size distribution along transverse direction (TD) was achieved. In addition, basal texture intensity was greatly weakened. As a result, tensile anisotropy was distinctly decreased and fracture elongation increased dramatically. (C) 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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