Journal
ACTA MATERIALIA
Volume 57, Issue 3, Pages 921-931Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.10.039
Keywords
Nickel alloys; Phase transformation kinetics; Polyphase microstructure; Bimodal microstructure; Interfaces
Funding
- French Ministere de la Recherche
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The phase-field approach is used to study the formation and ageing of bimodal microstructures in a model Ni-based superalloy. Particular attention is paid to the definition of interfacial energies in the presence of elastic strain fields and to the incorporation of these energies in the phase-field formalism. During a two-step annealing procedure, our model predicts the formation of large anisotropic gamma' precipitates (called secondary precipitates) and small, almost isotropic gamma' precipitates (called tertiary precipitates). Finally, the phase-field model is used to characterize the ageing of tertiary precipitates. In agreement with experiments, we show that the mean size of the tertiary precipitates first grows as t(1,3) and finally reaches a plateau. This peculiar behavior is explained using phase-field simulations with prescribed geometries and with the development of a simple analytic model. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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