Development of Fine-Grained Structure Caused by Friction Stir Welding Process of a ZK60A Magnesium Alloy

Sergey Mironov; Yoshinobu Motohashi; Rustam Kaibyshev; Hidetoshi Somekawa; Toshiji Mukai; Kaneaki Tsuzaki

doi:10.2320/matertrans.MRA2008192

Sergey Mironov, Yoshinobu Motohashi, Rustam Kaibyshev, Hidetoshi Somekawa, Toshiji Mukai, Kaneaki Tsuzaki

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Keywords: friction stir welding, magnesium alloy, electron back-scatter diffraction, microstructural evolution

JOURNAL FREE ACCESS

2009 Volume 50 Issue 3 Pages 610-617

DOI https://doi.org/10.2320/matertrans.MRA2008192

View "Advance Publication" version (January 28, 2009).

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Abstract

A fine-grained microstructure average grain size of which is around 2 μm was developed in ZK60A magnesium alloy subjected to a FSW process. Material flow arose mainly from basal slips and was governed by simple shear deformations caused by the tool rotation.
The development of the fine-grained structure was a complex process driven by severe plastic deformations, formation of deformation bands, grain splitting, twinning and dynamic and/or static recrystallizations. It appears also that the microstructural evolution depended on morphology of fine dispersoids.

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