High-pressure torsion of pure cobalt: Hcp-fcc phase transformations and twinning during severe plastic deformation

Kaveh Edalati, Shoichi Toh, Makoto Arita, Masashi Watanabe, Zenji Horita

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Cobalt with low stacking fault energy in the forms of bulk and powders was severely deformed using high-pressure torsion to investigate the influence of grain size on allotropic phase transformations. A phase transformation occurred from metastable fcc to hcp until the average grain size reached the submicrometer level. However, an hcp → fcc phase transformation with nanotwin formation occurred together with the formation of a distorted hcp structure when the grain size was reduced well to the nanometer level (∼20 nm). Mechanical and magnetic properties were also investigated.

Original languageEnglish
Article number181902
JournalApplied Physics Letters
Volume102
Issue number18
DOIs
Publication statusPublished - May 6 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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