Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 39, Pages 9558-9561Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.07.081
Keywords
Mg-Li alloy; High strain rate superplasticity; Deformation mechanism; Microstructure evolution
Categories
Funding
- National Natural Science Foundation of China [51001034]
- Fundamental Research funds for the Central Universities [HEUCF101008]
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An Mg-8Li-2Zn alloy plate was prepared through a two-pass extrusion process, and the high-temperature behavior of the alloy was investigated at 473-593 K under the initial strain rate of 1.0 x 10(-2)-1.0 x 10(-1) s(-1). The results indicated that the alloy exhibits a significant high strain rate super-plasticity with a maximum elongation of 279% under an initial strain rate of 1.0 x 10(-2) s(-1). The activation energy is 89.4 kJ/mol, indicating that the dominant deformation mechanism in the alloy is grain-boundary sliding controlled by grain-boundary diffusion. Cavities nucleate and coalesce during deformation, which is one of the results leading to the fracture of the material. (C) 2011 Elsevier B. V. All rights reserved.
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