High temperature strength of α Ti-Al alloys with a locally ordered structure

J. Koike, K. Egashira, K. Maruyama, H. Oikawa

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Tensile tests were performed in Ti-(7 ∼ 13)mol.%Al alloys at 1100 K. Stress-strain curves showed a large region of constant stress deformation. The results were analyzed by a Dorn type creep equation. The strain rate and the steady-state stress showed anomalous strength of the examined alloys in comparison with the previously reported Ti-(1 ∼ 5)mol.%Al alloys (H. Oikawa and T. Oomori, Mater. Sci. Eng., A104 (1988) 125). Both X-ray diffraction and transmission electron microscopy indicated the appearance of additional diffraction intensities that may owing to the formation of short range ordered (SRO) clusters. The anomalous creep strength observed in the present work seems to be caused by the retardation of dislocation glide by the SRO clusters.

Original languageEnglish
Pages (from-to)98-102
Number of pages5
JournalMaterials Science and Engineering A
Volume213
Issue number1-2
DOIs
Publication statusPublished - 1996 Aug 15

Keywords

  • Alpha alloys
  • Creep
  • Microstructure
  • Steady-state deformation
  • Strength
  • Ti-Al alloy

ASJC Scopus subject areas

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

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