期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 541, 期 -, 页码 372-375出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.06.067
关键词
Mg-Li alloy; Superplasticity; Deformation mechanism
资金
- National Natural Science Foundation of China [51001034]
- Fundamental Research funds for the Central Universities [HEUCF201210004]
- Heilongjiang Province Youth Skeleton Program [1252G018]
An Mg-8%Li-2%Zn (LZ82) alloy was prepared by melt casting and then extruded and rolled, the superplasticity at elevated temperature of the specimens of obtained alloy at the temperature range of 423 K-523 K under the initial strain rate of 1.6 x 10(-4)-1.0 x 10(-2) s(-1) was investigated. The results indicate that the alloy exhibits significant superplasticity with a maximum elongation of 430% at the temperature of 498 K, even when the temperature decrease to 423 K, the maximum elongation exceed 100%, reached 120%. The activation energy under the optimum condition is 99.24 kJ/mol, and the strain rate sensitivity m is measured as 0.55, indicating that the dominant deformation mechanism in the alloy is grain-boundary sliding controlled by grain-boundary diffusion. (C) 2012 Elsevier B. V. All rights reserved.
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