Effect of order-disorder transition on plastic anomaly of Ti3Al single crystals deforming by prism slip

T. Nakano, Y. Koizumi, T. Tsujimoto, Y. Umakoshi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Plastic behaviour of Ti3Al single crystals was investigated at high temperatures focusing on the order-disorder transition. When the crystals deformed above 700°C by the {10 1 0} <1 2 10> prism slip, yield stress anomalously increased with increasing temperature and showed a peak just below the critical temperature (Tc) for ordering. The critical resolved shear stress (CRSS) for prism slip did not obey the Schmid law at high temperatures, and the extent of violation increased as the anomalous strengthening became significant. The CRSS for the (0001) <1 2 10> basal slip was higher than that for the prism slip below Tc, while this relation of the two slips was reversed above Tc. A marked difference in deformation substructure between the basal and prism slips was observed in crystals deformed at 1100°C; almost all 1/3 <1 2 10> superlattice dislocations on the prism plane were preferentially aligned in directions parallel or perpendicular to [0 0 0 1], while widely separated superpartials bound by an anti-phase boundary were randomly distributed on the basal plane showing no preferentially oriented alignment.

Original languageEnglish
Pages (from-to)571-579
Number of pages9
JournalIntermetallics
Volume4
Issue number7
DOIs
Publication statusPublished - 1996

Keywords

  • A. titanium aluminides
  • B. mechanical properties at high temperatures
  • Based on TiAl
  • Order-disorder transformations

ASJC Scopus subject areas

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

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