Creep behavior and substructures of α2 Ti-34mol%Al intermetallics

Yuji Nagae, Toshihiko Fukuda, Makoto Ohtsuka, Hiroyuki Sato, Hiroshi Oikawa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The creep behavior of α2 Ti-34mol%Al has been investigated at 1050-1250 K under 70-500 MPa. The effect of the initial grain-size in the range 40-130 μm has also been studied. Characteristics of stress and temperature dependence of the minimum creep-rate can be classified into three regions: the stress exponent, the activation energy and the grain-size exponent for the minimum creep-rate have a set of characteristic values in each region. The formation of deformation twins and their growth play an important role in the recovery process of creep in higher stress regions at least up to the strain attaining the minimum creep-rate. In lower stress regions, the glide and recovery of dislocations play an essential role in creep.

Original languageEnglish
Pages (from-to)321-328
Number of pages8
JournalIntermetallics
Volume5
Issue number4
DOIs
Publication statusPublished - 1997

Keywords

  • A. titanium aluminides, based on TiAl and TiAl
  • B. creep (properties and mechanisms), twinning
  • D. defects: dislocation geometry and arrangement

ASJC Scopus subject areas

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

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