Structural rejuvenation in a bulk metallic glass induced by severe plastic deformation

W. Dmowski, Y. Yokoyama, A. Chuang, Y. Ren, M. Umemoto, K. Tsuchiya, A. Inoue, T. Egami

Research output: Contribution to journalArticlepeer-review

112 Citations (Scopus)

Abstract

Using high-energy X-ray diffraction we examined the atomic structure in bulk metallic glass samples which underwent severe plastic deformation by the high-pressure torsion (HPT) technique. We obtained the atomic pair distribution function (PDF) and determined the changes in the PDFs due to deformation. The observed changes in the PDF clearly show structural disordering, which suggests structural rejuvenation by heavy deformation. However, the changes cannot be explained simply in terms of creating excess free volume, and they indicate that much more extensive atomic rearrangements take place as a consequence of deformation. Also, we suggest that the observed structural change may well be an outcome of local heating due to deformation and may not directly provide the knowledge of the atomistic mechanism of strain localization.

Original languageEnglish
Pages (from-to)429-438
Number of pages10
JournalActa Materialia
Volume58
Issue number2
DOIs
Publication statusPublished - 2010 Jan

Keywords

  • Bulk amorphous materials
  • Pair distribution function
  • Plastic deformation
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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