Prediction of mechanical behaviour in Ni-base superalloys using the phase field model of dislocations

Vorontsov, V.A. and Voskoboinikov, R.E. and Rae, C.M.F. (2011) Prediction of mechanical behaviour in Ni-base superalloys using the phase field model of dislocations. Advanced Materials Research, 278. pp. 150-155. ISSN 1022-6680 (https://doi.org/10.4028/www.scientific.net/AMR.278...)

[thumbnail of Vorontsov-etal-AMR-2011-Prediction-of-mechanical-behaviour-in-Ni-base-superalloys-using-the-phase-field-model-of-dislocations]
Preview
Text. Filename: Vorontsov_etal_AMR_2011_Prediction_of_mechanical_behaviour_in_Ni_base_superalloys_using_the_phase_field_model_of_dislocations.pdf
Final Published Version
License: Creative Commons Attribution 4.0 logo

Download (1MB)| Preview

Abstract

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 (γ-surface) data obtained from atomistic simulations. The topography of this surface determines the shearing mechanisms observed in the model. The merit of the new γ-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.