Plastic deformation of metal thin films without involving dislocations and anomalous production of point defects

Michio Kiritani, Kazufumi Yasunaga, Yoshitaka Matsukawa, Masao Komatsu

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

Evidence for plastic deformation of crystalline metal thin films without involving dislocations is presented. Direct observation of the films during deformation under an electron microscope confirmed the absence of dislocations even for heavy deformation. In fee metals, including aluminum, deformation leads to the formation of an anomalously high density of vacancy clusters, in the form of stacking fault tetrahedra. These vacancy clusters distribute uniformly when deformation is completed rapidly, but they disappear upon additional deformation, leading to nonuniform distribution of vacancy clusters. Vacancy cluster formation is suppressed when deformation speed is below a certain limit, and this is explained by the escape of deformation-induced vacancies during deformation. Some clusters are formed directly by deformation, and they grow by absorbing deformation-induced vacancies. A new atomistic model for plastic deformation of crystalline metals without involving dislocations is proposed, in which 'glide elements' execute deformation and their reaction produces point defects. Conditions required for operation of the new deformation mechanism is sought in the increase of internal stress under conditions where dislocations tend not to be generated. The possibility of high-speed deformation of bulk materials by this new mechanism is suggested.

Original languageEnglish
Pages (from-to)3-24
Number of pages22
JournalRadiation Effects and Defects in Solids
Volume157
Issue number1-2
DOIs
Publication statusPublished - 2002

Keywords

  • Dislocations
  • Electron microscopy
  • Plastic deformation
  • Point defect clusters
  • Thin films

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Condensed Matter Physics

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