Dislocation dipoles in cyclically deformed Ti3Al single crystals

Y. Koizumi, T. Nakano, Y. Umakoshi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Dislocation dipoles and debris in Ti3Al single crystals fatigued at 300 and 77 K were examined focusing on geometric configuration and formation mechanism of superlattice dislocation dipole (superdipole). Longer and lower density debris were observed more at 77 than at 300 K. Although the superdipoles composed of S-type and Z-type configurations may exist, all superdipoles observed in present Ti3Al had Z-type stable configuration. Geometric configuration of superdipoles was calculated on the basis of elastic theory. The superdipole height was estimated from the relation between the height and the separation distance of each superpartial in the superdipole. Debris (short superdipoles) formation is triggered dominantly by jog formation due to the double cross slip and it is controlled by the thermally activated pinching off process.

Original languageEnglish
Pages (from-to)179-186
Number of pages8
JournalIntermetallics
Volume8
Issue number2
DOIs
Publication statusPublished - 2000 Feb

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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