Evaluation of the stability of raft structure in nickel base superalloys throughout their lifetime

Katsushi Tanaka, Toru Inoue, Tetsu Ichitsubo, Kyosuke Kishida, Haruyuki Inui

Research output: Contribution to journalConference article

Abstract

Stability of raft structure in nickel base superalloys has been examined by using elastic energy calculations based on a microelasticity theory. The numerical calculation method for a structurally heterogeneous system is applied. The results indicate that the raft structure is significantly stabilized by introductions of creep deformations till the critical creep deformation at which the lattice misfit between γ and γ′ phases is completely compensated by creep dislocations. When the magnitude of creep deformations exceed the critical value, the (001) lamellar interfaces become elastically unstable and a tilted lamellar interface become the most stable one. This instability of the 001 raft structure leads a tilted or wavy lamellar interfaces for reducing the internal strain energy, that is a precursor to collapse the raft structure.

Original languageEnglish
Pages (from-to)493-498
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume980
Publication statusPublished - 2007 Jun 29
Externally publishedYes
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: 2006 Nov 272006 Nov 29

ASJC Scopus subject areas

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

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