Anomalous production of vacancy clusters and the possibility of plastic deformation of crystalline metals without dislocations

M. Kiritani, Y. Satoh, Y. Kizuka, K. Arakawai, Y. Ogasawara, S. Arai, Y. Shimomura

Research output: Contribution to journalArticlepeer-review

122 Citations (Scopus)

Abstract

High-speed heavy plastic deformation of thin foils of fcc metals, including aluminium, is found to produce a high density of small vacancy clusters, in the form of stacking-fault tetrahedra. The dependences of the density of the clusters on the deformation temperature and deformation rate indicate the production of vacancy clusters from deformation-induced dispersed vacancies. Neither dislocations nor any indication of the reaction of dislocations are present in the regions containing a high density of vacancy clusters. A possible model is proposed that describes, at extremely high strain rates where dislocation generation is difficult, how a high concentration of point defects is produced by a large number of parallel shifts of atomic planes without dislocations.

Original languageEnglish
Pages (from-to)797-804
Number of pages8
JournalPhilosophical Magazine Letters
Volume79
Issue number10
DOIs
Publication statusPublished - 1999 Oct 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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