Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 9, Pages 2335-2341Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.12.029
Keywords
Superplasticity; Magnesium-lithium alloy; Dynamic grain growth; Deformation mechanism
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Funding
- National Natural Science Foundation of China [50774023]
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The maximum superplasticity of 850% and 920% were demonstrated in Mg-7.83Li alloy and Mg-8.42Li alloy at 573 K and at an initial strain rate of 1.67 x 10(-3) s(-1) and at an initial strain rate of 5 x 10(-4) s(-1), respectively. Optical microstructural observations revealed that dynamic grain growth appears at 573 K. Different atomic mobilities of Mg, Li, alpha 5.7Li phase and beta(l I Li) phase and different Gibbs free energies of alpha 5.7Li phase and beta(l I Li) phase contribute to the obvious dynamic grain growth at 573 K. The dynamic grain sizes at 573 K were calculated by derived model. It is shown by comparing the stress exponent (n), grain size exponent (p), and deformation activation energy (Q) estimated experimentally with constructed deformation mechanism map incorporating dislocation quantities inside grains that the dominant deformation mechanisms in two alloys are grain boundary sliding accommodated by slip controlled by lattice diffusion. Crown Copyright (C) 2009 Published by Elsevier B.V. All Fights reserved.
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