High-temperature superplastic behavior and ECAP deformation mechanism of two-phase Mg-Li alloy

•A new two-phase Mg-Li alloy was deformed by ECAP to refine its grains and improve its strength.•Li loss appears in β phase during superplastic deformation.•The dominant deformation mechanism is grain boundary sliding. Fine grains of Two-phase Mg-Li alloy could be achieved by severe plastic deformat...

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Bibliographic Details
Published in:Materials letters 2021-10, Vol.301, p.130358, Article 130358
Main Authors: Chen, Dexin, Kong, Jing, Gui, Zhenzhen, Li, Wei, Long, Yan, Kang, Zhixin
Format: Article
Language:English
Subjects:
Deformation mechanism
Deformation mechanisms
Elongation
Grain boundary sliding
High temperature
Magnesium base alloys
Materials science
Metals and alloys
Microstructure
Plastic deformation
Strain rate sensitivity
Superplasticity
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Summary:•A new two-phase Mg-Li alloy was deformed by ECAP to refine its grains and improve its strength.•Li loss appears in β phase during superplastic deformation.•The dominant deformation mechanism is grain boundary sliding. Fine grains of Two-phase Mg-Li alloy could be achieved by severe plastic deformation. The alloy exhibited a superplastic behavior with a maximum elongation of 306.6% at 623 K with an initial rate of 1.5 × 10−2 s−1. The value of the strain rate sensitivity under 623 K and 1.5 × 10−2s−1 is 0.36, and 121.6–160.0 kJ/mol. The dominant deformation mechanism in this alloy is grain boundary sliding accommodated by a slip which was controlled by lattice diffusion at 523–623 K.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.130358