Elastic anisotropy of rafted Ni-base superalloy at high temperatures

Tetsu Ichitsubo, Daisuke Koumoto, Masahiko Hirao, Katsushi Tanaka, Makoto Osawa, Tadaharu Yokokawa, Hiroshi Harada

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

The elastic constants of the rafted Ni-base single-crystal superalloy, TMS-26, at high temperatures (∼1000 °C) have been studied with acoustic resonance methods. The rafted superalloy can be regarded as an elastic body of tetragonal symmetry. The elastic anisotropy factors, c11/c 33 and E100/E001, increase with temperature up to 1.010-1.025. Although a micromechanics model can reproduce this trend, the calculated anisotropy (∼1.001) is much smaller than the measurements, which can be related with the internal strain due to the lattice misfit. The elastic anisotropy of E001 < E100 = E010 contributes to the transverse rafting under external stress.

Original languageEnglish
Pages (from-to)4863-4869
Number of pages7
JournalActa Materialia
Volume51
Issue number16
DOIs
Publication statusPublished - 2003 Sep 15

Keywords

  • Acoustic methods
  • Alloys (nickel)
  • Annealing
  • Mechanical properties (elastic)
  • Micromechanics

ASJC Scopus subject areas

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

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