Evolution of orientation distributions of γ and γ′ phases during creep deformation of Ni-base single crystal superalloys

Toru Inoue, Katsushi Tanaka, Hiroki Adachi, Kyosuke Kishida, Norihiko L. Okamoto, Haruyuki Inui, Tadaharu Yokokawa, Hiroshi Harada

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The evolution of orientation distributions of γ and γ′ phases in crept Ni-base single crystal superalloys have been investigated by theoretical calculations with elastic-plastic models and by experiments. As creep deformation proceeds, the crystallographic orientation distributions for both phases are broadened as a result of the waving of the raft structure, which occurs to reduce the total mechanical energy. The broadening of the orientation distribution occurs in such a way that the 0 0 1 pole broadens isotropically while the h k 0 poles broaden preferentially along the 〈0 0 1〉 directions. Since the extent of the broadening increases almost linearly with the number of creep deformation, the measurement of the broadening by X-ray diffraction can be utilized in non-destructive methods to predict the lifetime of Ni-base superalloys.

Original languageEnglish
Pages (from-to)1078-1085
Number of pages8
JournalActa Materialia
Volume57
Issue number4
DOIs
Publication statusPublished - 2009 Feb
Externally publishedYes

Keywords

  • Continuum mechanics
  • Dynamic phenomena
  • Nickel alloys

ASJC Scopus subject areas

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

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