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

Yuichi Miyahara, Kiyoshi Matsubara, Zenji Horita, Terence G. Langdon

Research output: Contribution to journalArticle

66 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1705-1711
Number of pages7
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume36
Issue number7
DOIs
Publication statusPublished - Jan 1 2005

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superplasticity
Equal channel angular pressing
Superplasticity
Grain refinement
magnesium alloys
pressing
Magnesium alloys
Extrusion
grain size
billets
elongation
strain rate
magnesium
inspection
Processing
Grain growth
Magnesium
annealing
Strain rate
Elongation

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Grain refinement and superplasticity in a magnesium alloy processed by equal-channel angular pressing. / Miyahara, Yuichi; Matsubara, Kiyoshi; Horita, Zenji; Langdon, Terence G.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 36, No. 7, 01.01.2005, p. 1705-1711.

Research output: Contribution to journalArticle

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