Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy

Kaveh Edalati, Takahiro Masuda, Makoto Arita, Mitsuaki Furui, Xavier Sauvage, Zenji Horita, Ruslan Z. Valiev

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Superplasticity, a phenomenon of high tensile elongation in polycrystalline materials, is highly effective in fabrication of complex parts by metal forming without any machining. Superplasticity typically occurs only at elevated homologous temperatures, where thermally-activated deformation mechanisms dominate. Here, we report the first observation of roomerature superplasticity in a magnesium alloy, which challenges the commonly-held view of the poor roomerature plasticity of magnesium alloys. An ultrafine-grained magnesium-lithium (Mg-8 wt.%Li) alloy produced by severe plastic deformation demonstrated 440% elongation at room temperature (0.35 T m) with a strain-rate sensitivity of 0.37. These unique properties were associated with enhanced grain-boundary sliding, which was approximately 60% of the total elongation. This enhancement originates from fast grain-boundary diffusion caused by the Li segregation along the grain boundaries and the formation of Li-rich interphases. This discovery introduces a new approach for controlling the roomerature superplasticity by engineering grain-boundary composition and diffusion, which is of importance in metal forming technology without heating.

Original languageEnglish
Article number2662
JournalScientific reports
Volume7
Issue number1
DOIs
Publication statusPublished - Dec 1 2017

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superplasticity
magnesium alloys
grain boundaries
elongation
metal forming
room temperature
plastic properties
machining
plastic deformation
strain rate
sliding
magnesium
lithium
engineering
fabrication
heating
augmentation
temperature

All Science Journal Classification (ASJC) codes

  • General

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Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy. / Edalati, Kaveh; Masuda, Takahiro; Arita, Makoto; Furui, Mitsuaki; Sauvage, Xavier; Horita, Zenji; Valiev, Ruslan Z.

In: Scientific reports, Vol. 7, No. 1, 2662, 01.12.2017.

Research output: Contribution to journalArticle

Edalati, Kaveh ; Masuda, Takahiro ; Arita, Makoto ; Furui, Mitsuaki ; Sauvage, Xavier ; Horita, Zenji ; Valiev, Ruslan Z. / Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy. In: Scientific reports. 2017 ; Vol. 7, No. 1.
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