期刊
SCRIPTA MATERIALIA
卷 65, 期 4, 页码 335-338出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2011.04.041
关键词
Superplasticity; Magnesium alloys; Friction stir processing; Microstructure; Grain boundaries
类别
资金
- National Natural Science Foundation of China [50901075, 50890171]
- National Outstanding Young Scientist Foundation [50525103]
Friction stir processing was applied to hot-rolled Mg-Zn-Y-Zr alloy to produce a fine-grained structure 4.5 mu m in size with fine, uniformly distributed Mg3Zn3Y2 particles and predominant high-angle grain boundaries (HAGBs) of 91%. A maximum superplasticity of 1110% was achieved at a high strain rate of 1 x 10(-2) s(-1) and 450 degrees C. The superior superplasticity at this high strain rate is attributed to the excellent thermal stability of the fine-grained structure and the high percentage of HAGBs. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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