Rafting and elastoplastic deformation of superalloys studied by neutron diffraction

James Coakley*, Eric A. Lass, Dong Ma, Matthew Frost, David N. Seidman, David C. Dunand, Howard J. Stone

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The rafting of monocrystalline Ni- and Co-based superalloys has been studied by neutron diffractometry. Lattice parameter misfit values and the difference in phase stiffnesses at room temperature, 650 °C, and 900 °C are presented. These microstructural parameters should assist in refining computer models that aim to predict precipitate evolution in superalloys and aid future alloy design. The nature of rafting is shown experimentally to be dependent upon the lattice parameter misfit. The 900 °C yield strength of the γ-phase of the Co-based superalloy with a rafted microstructure occurs at ∼ 100 MPa, when loaded at a low strain rate.

Original languageEnglish (US)
Pages (from-to)110-114
Number of pages5
JournalScripta Materialia
Volume134
DOIs
StatePublished - Jun 1 2017

Keywords

  • Elastic behaviour
  • Neutron diffraction
  • Rafting
  • Superalloy
  • Yield phenomena

ASJC Scopus subject areas

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

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