Phase field modelling of stacking fault shear in nickel base superalloys

V. A. Vorontsov, C. M. F. Rae, R. Voskoboinikov, C. Shen, Y. Wang, D. Dye

Research output: Contribution to conferencePosterpeer-review

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Stacking fault shear (SFS) is the dominant creep deformation mechanism in Nibase superalloys subjected to primary creep conditions (750°C, 800MPa). TEM observations1 have shown that the source of plastic strain is the shearing of they' precipitates by dislocation ribbons with overall burgers vector of a< 112 >. SFS can only occur when they matrix is sufficiently saturated with a/2 < 110> dislocations. These matrix dislocations are unable to cut the y' because of the high energy APB they leave in their wake. By combining into a ribbon, shearing of the precipitates is facilitated by formation of intrinsic and extrinsic stacking faults (SISF and SESF).
Original languageEnglish
Number of pages1
Publication statusPublished - 17 Oct 2008
EventDislocations 2008: An international conference on the fundamentals of plastic deformation - Hong Kong Gold Coast Hotel, Hong Kong, Hong Kong
Duration: 13 Oct 200817 Oct 2008


ConferenceDislocations 2008
Country/TerritoryHong Kong
CityHong Kong
Internet address


  • stacking fault shear
  • deformation
  • creep conditions


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