Plastic deformation behaviour and dislocation structure in Ti3Al single crystals cyclically deforming by prism slip

T. Nakano, B. Ogawa, Y. Koizumi, Y. Umakoshi

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The effect of prism slip on cyclic hardening and deformation substructure in Ti3Al single crystals cyclically deformed was examined. Fatigue tests were carried out in a symmetrical tension/compression mode at a fixed total strain amplitude (Δε) of ±0.2% to ±0.4% at room temperature. As Δε and the number of cycles increased, the stress amplitude rose depending on crystal orientation. The cyclic hardening was more accelerated for specimens deformed by double prism slips than for those deformed by single prism slip. At the saturated stage, the edge dipoles and/or multipoles gathered at a localized region and formed bundles with a high residual stress field in specimens deforming by double prism slips, while a high density of dislocations existed the bundled structure did not develop under operation of single prism slip. The peculiar structure containing bundles was called saturated bundled structure (SBS). The formation process of the SBS and the role of the bundled structure on the plastic behaviour are described.

Original languageEnglish
Pages (from-to)4311-4324
Number of pages14
JournalActa Materialia
Volume46
Issue number12
DOIs
Publication statusPublished - 1998 Jul 24

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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