Phase field modelling of stacking fault shear in nickel base superalloys

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Vorontsov, V. A. and Rae, C. M. F. and Voskoboinikov, R. and Shen, C. and Wang, Y. and Dye, D. (2008) Phase field modelling of stacking fault shear in nickel base superalloys. In: Dislocations 2008, 2008-10-13 - 2008-10-17, Hong Kong Gold Coast Hotel.

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Abstract

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).

ORCID iDs

Vorontsov, V. A. ORCID logoORCID: https://orcid.org/0000-0002-1958-0602, Rae, C. M. F., Voskoboinikov, R., Shen, C., Wang, Y. and Dye, D.;
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