Temperature and strain rate dependence of deformation-induced point defect cluster formation in metal thin foils

K. Yasunaga, Y. Matsukawa, M. Komatsu, M. Kiritani

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

The mechanism of plastic deformation in thin metal foils without involving dislocations was examined by investigating the variations in vacancy cluster formation during deformation for a range of deformation speeds and temperatures. The deformation morphology was not seen to change appreciably over a very wide range of strain rate, 10-4/s-106s, whereas the number density of vacancy clusters was observed to increase with increasing strain rate up to saturation value that is dependent on materials and temperature. The density of vacancy clusters decreased to zero with decreasing deformation speed. The strain rate at which the density of vacancy clusters begins to decrease was found to be proportional to the vacancy mobility, suggesting that the vacancies are generated as dispersed vacancies and escape to the specimen surfaces during slow deformation without forming clusters. A very long tail in the distribution of the density of vacancy clusters towards lower strain rates was reasonably attributed to the generation of small vacancy complexes due to deformation. These results give valuable information that can be used to establish new models for plastic deformation of crystalline metals without involving dislocations.

Original languageEnglish
Pages (from-to)P3.5.1-P3.5.6
JournalMaterials Research Society Symposium - Proceedings
Volume673
DOIs
Publication statusPublished - 2001 Jan 1
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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