Dislocation distributions in monocrystalline nickel-based superalloys subjected to thermo-mechanical fatigue with and without hold times

F. Sun, J. Zhang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The characteristics of dislocation configurations under thermo-mechanical fatigue cycling were investigated in [001] oriented nickel-based single-crystal superalloys. Thermo-mechanical fatigue tests were performed on TMS-75 (without hold time) and TMS-82 (with hold time) superalloys. The specimens were subsequently studied by transmission electron microscopy under two-beam conditions. In TMS-75 superalloy, cross-slipping is the main characteristic for the low number of dislocations. In TMS-82 superalloy, more complex process of dislocation configurations has been demonstrated in detail, involving five stages: after the first stress relaxation, after the first tensile plastic deformation, after the second stress relaxation, after 30 cycles and after rupture. In addition, for TMS-82 superalloy, there is a reversible movement behaviour of stacking faults that occur in compression and disappear in tension. After rupture, the number of dislocation is related to the hold time. Longer hold time could generate a higher degree of stress relaxation and produce more dislocations with climbing characteristic.

Original languageEnglish
Pages (from-to)992-1001
Number of pages10
JournalFatigue and Fracture of Engineering Materials and Structures
Volume37
Issue number9
DOIs
Publication statusPublished - 2014 Sep
Externally publishedYes

Keywords

  • dislocation
  • superalloys
  • thermo-mechanical fatigue (TMF)
  • transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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