Plastic deformation of thin metal foils without dislocations and formation of point defects and point defect clusters

Michio Kiritani, Kazufumi Yasunaga, Yoshitaka Matsukawa, Masao Komatsu

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)

Abstract

Evidence for plastic deformation of crystalline metal thin foils without dislocations is presented. Direct observation during deformation under an electron microscope confirmed the absence of the operation of dislocations even for heavy deformation. In fcc metals including aluminum, deformation leads to the formation of an anomalously high density of vacancy clusters, in the form of stacking fault tetrahedra. The dependency of vacancy cluster formation on temperature and deformation speed indicates that the clusters are formed by the aggregation of deformation-induced vacancies. Conditions required for the absence of the dislocation mechanism are explained, and a new atomistic model for plastic deformation of crystalline metals is proposed.

Original languageEnglish
Pages (from-to)P7.11.1-P7.11.6
JournalMaterials Research Society Symposium - Proceedings
Volume673
DOIs
Publication statusPublished - 2001
EventDislocations and Deformation Mechanics in Thin Films and Small Structures - San Francisco, CA, United States
Duration: 2001 Apr 172001 Apr 19

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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