Point defect production under high internal stress without dislocations in Ni and Cu

K. Sato, T. Yoshiie, Y. Satoh, Q. Xu, E. Kuramoto, M. Kiritani

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Kiritani et al. have observed a large number of small vacancy clusters without dislocations at the tip of torn portions of fee metals such as Au, Ag, Cu and Ni. Small vacancy clusters, rather than dislocation cell structures, have also been observed after high-speed compressive deformation, suggesting the possibility of plastic deformation without dislocations. In this paper, in order to investigate the mechanism of deformation without dislocations, change in formation energy of point defects under high internal stress was estimated by computer simulation. Elastic deformation up to ±20% strain was found to provide a remarkable lowering of formation energy of point defects. For example, when Ni is subjected to elastic strain, the formation energy of an interstitial atom decreases to 40% that without strain and the formation energy of a vacancy decreases to 51% that without strain. The number of point defects formed under thermal equilibrium during deformation was evaluated. The number was judged to be insufficient for explaining the formation of vacancy clusters as observed in experiments.

Original languageEnglish
Pages (from-to)171-178
Number of pages8
JournalRadiation Effects and Defects in Solids
Issue number1-2
Publication statusPublished - 2002


  • Cu
  • Ni
  • Plastic deformation
  • Point defect
  • Thermal equilibrium

ASJC Scopus subject areas

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


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