High-strain-rate superplasticity of fine-grained Mg–6Zn–0.5Zr alloy subjected to low-temperature indirect extrusion

A commercial Mg–6Zn–0.5Zr alloy was subjected to low-temperature indirect extrusion for grain refinement and the tensile properties of the extruded alloy at 250°C were investigated. After extrusion, the alloy showed finely recrystallized grains with an average size of 1.6μm. High-strain-rate superpl...

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Bibliographic Details
Published in:Scripta materialia 2017-12, Vol.141, p.138-142
Main Authors: Kim, Beomcheol, Kim, Jong Chan, Lee, Sooseok, Lee, Ki-Suk, Lee, Jung Gu, Park, Sung Soo
Format: Article
Language:English
Subjects:
Extrusion
Grain refinement
High-strain-rate superplasticity
Magnesium alloy
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Summary:A commercial Mg–6Zn–0.5Zr alloy was subjected to low-temperature indirect extrusion for grain refinement and the tensile properties of the extruded alloy at 250°C were investigated. After extrusion, the alloy showed finely recrystallized grains with an average size of 1.6μm. High-strain-rate superplasticity was observed in the fine-grained alloy, which exhibited a tensile elongation of up to 800% at a strain rate of 0.01s−1. Experimental results demonstrating the occurrence of grain boundary sliding during the high-strain-rate superplastic deformation are presented. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2017.08.008