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Grain refinement and superplasticity in a magnesium alloy processed by equal-channel angular pressing

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Abstract

The extrusion/equal channel angular pressing (EX-ECAP) processing procedure, in which magnesium-based alloys are subjected to extrusion followed by ECAP, was applied to a Mg-7.5 pct Al-0.2 pct Zr alloy prepared by casting. Microstructural inspection showed the EX-ECAP process was effective in reducing the grain size from ∼21 µm after extrusion to an as-pressed grain size of ∼0.8 µm. It is shown through static annealing that these ultrafine grains are reasonably stable up to 473 K, but grain growth occurs at higher temperatures. Tensile specimens were cut from the billets prepared by EX-ECAP and testing showed these specimens exhibited superplasticity at relatively low temperatures with maximum elongations up to >700 pct. By processing through EX-ECAP to a higher imposed strain and thereby increasing the area fraction of high-angle boundaries, it is demonstrated that there is a potential for achieving high-strain-rate superplasticity.

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Authors and Affiliations

  1. the Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, 812-8581, Fukuoka, Japan

    Yuichi Miyahara (Graduate Student), Kiyoshi Matsubara (Graduate Student) & Zenji Horita (Professor)

  2. the Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, 90089-1453, Los Angeles, CA

    Terence G. Langdon (Professor)

Authors
  1. Yuichi Miyahara
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  2. Kiyoshi Matsubara
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  3. Zenji Horita
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  4. Terence G. Langdon
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Additional information

This article is based on a presentation made at the Symposium entitled “Phase Transformations and Deformation in Magnesium Alloys,” which occurred during the Spring TMS meeting, March 14–18, 2004, in Charlotte, NC, under the auspices of the ASM-MSCTS Phase Transformations Committee.

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Miyahara, Y., Matsubara, K., Horita, Z. et al. Grain refinement and superplasticity in a magnesium alloy processed by equal-channel angular pressing. Metall Mater Trans A 36, 1705–1711 (2005). https://doi.org/10.1007/s11661-005-0034-2

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