Defect structures introduced in FCC metals by high-speed deformation

Michio Kiritani, Takashi Sota, Tamae Tawara, Hiroshi Arimura, Kazufumi Yasunaga, Yoshitaka Matsukawa, Masao Komatsu

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Variation in defect microstructures introduced by compression of three fcc metals, Al, Cu and Ni, was investigated over a wide range of strain rate, from 10-2 to 106/s. Dislocations formed under high-speed deformation are randomly distributed, whereas dislocations formed under low-speed deformation develop into cell structures, the transition between the two being at a strain rate of 103. Dislocations of opposite signs are equally mixed in high-speed deformation, whereas grouped dislocations in low-speed deformation are composed of unbalanced numbers of dislocations of opposite signs. In high-speed deformation vacancy clusters are formed at high density all over the matrix, whereas in low-speed deformation only a few numbers of vacancy clusters are formed in the area of localized distribution of dislocations, the boundary between these two characteristics being at the transition of the nature of dislocation distribution. In the high-speed deformation vacancy clusters are formed by the aggregation of deformation-induced vacancies, whereas in low-speed deformation they are produced directly by dislocation reaction during deformation. Stress during high-speed compression has been estimated to increase to more than 10 GPa. A model of plastic deformation that produces vacancies at high concentration is proposed, in which high-speed plastic deformation proceeds without involving dislocations.

Original languageEnglish
Pages (from-to)53-74
Number of pages22
JournalRadiation Effects and Defects in Solids
Volume157
Issue number1-2
DOIs
Publication statusPublished - 2002

Keywords

  • Dislocations
  • Electronmicroscopy
  • FCC metals
  • High speed deformation
  • Point defect clusters

ASJC Scopus subject areas

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

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