Plastic deformation of bcc metal thin foils without dislocation

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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Heavy plastic deformation of fce metal thin foils to fracture has been found recently to proceed without involving dislocations, and it results in the formation of high density of vacancy clusters. Thin foil specimens of bcc metals such as V and Mo were plastically deformed to fracture in in situ elongation experiments under an electron microscope. Morphology of thinning and fracture was found to be similar to fcc metals, and no dislocation was observed during heavy deformation. Electron diffraction analysis at the tip of a crack during deformation confirmed a large elastic deformation of up to 5%. Unlike in fcc metal thin foil specimens, point defect clusters were not observed near fractured tips. This difference is attributed to the difference in vacancy reaction, though the deformation in bcc metals without dislocation most likely does produce vacancies.

Original languageEnglish
Pages (from-to)25-29
Number of pages5
JournalMaterials Science and Engineering A
Issue number1-2
Publication statusPublished - 2003 Jun 15
Externally publishedYes


  • Bcc metals
  • Elastic deformation
  • Electron microscope
  • In situ deformation
  • Point defect clusters

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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