Prediction of Mechanical Behaviour in Ni-Base Superalloys Using the Phase Field Model of Dislocations

Abstract:

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The “Phase-Field Model of Dislocations” (PFMD) was used to simulate shearing of gamma-prime precipitate arrays in single crystal turbine blade superalloys. The focus of the work has been on the cutting of the L12 ordered precipitates by a<112>{111} dislocation ribbons during Primary Creep. The Phase Field Model presented incorporates specially developed Generalised Stacking Fault Energy (–surface) data obtained from atomistic simulations. The topography of this surface determines the shearing mechanisms observed in the model. The merit of the new –surface, is that it accounts for the formation of extrinsic stacking faults, making the model more relevant to creep deformation of superalloys at elevated temperatures.

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Edited by:

M. Heilmaier

Pages:

150-155

DOI:

10.4028/www.scientific.net/AMR.278.150

Citation:

V.A. Vorontsov et al., "Prediction of Mechanical Behaviour in Ni-Base Superalloys Using the Phase Field Model of Dislocations", Advanced Materials Research, Vol. 278, pp. 150-155, 2011

Online since:

July 2011

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