期刊
JOURNAL OF MAGNESIUM AND ALLOYS
卷 8, 期 4, 页码 1228-1237出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.jma.2019.12.012
关键词
Mg-Gd-Y-Zn-Zr alloy; Rotary backward extrusion; Dynamic recrystallization; Texture
资金
- National Natural Science Foundation of China [51775520]
- National Key Research and Development Plan [2016YFB0301103-3]
Gleeble-3500 thermal simulator was applied to realize the rotary backward extrusion forming of Mg-13Gd-4Y-2Zn-0.5Zr (wt%) alloy at different circumferential strain rate from 0.009 s(-1) to 0.027 s(-1) at 400 degrees C and the dynamic recrystallization mechanism and texture evolution were studied. The results show that the grain size of the alloy was obviously refined after rotary backward extrusion. As the circumferential strain rate increased, the dynamic recrystallization fraction gradually increased causing the grain size decreased and the distribution of microstructure became more uniform. At the same time, the texture of {0001}, {10-10}, {11-20} was weakened and the grain orientation distribution became more random. With the increase of circumferential strain rate, the discontinuous dynamic recrystallization mechanism became dominant, which promoted the weakening of texture and grain refinement of the alloy. (C) 2020 Published by Elsevier B.V. on behalf of Chongqing University.
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