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An anisotropic lattice gas is employed in Monte Carlo simulations to model the microstructural evolution of single crystal superalloys at elevated temperature both with and without an applied load. This model has been produced using a recently developed criterion to predict anisotropic gamma' particle coarsening under applied stresses, based on the ratio between the energies of the gamma-gamma' interfacial mismatch dislocations in the directions parallel and perpendicular to the stress axis. The evolution of the gamma' precipitates and their aspect ratios are presented for a range of temperatures and stresses. Modelling results are found to compare well with experimental data for NASAIR 100. Further extensions and possible applications of the model are outlined.

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Authors: VALLÉS J L, JRC Petten (NL);ARRELL D J, JRC Petten (NL)
Bibliographic Reference: Article: Acta Metallurgica et Materialia, Vol. 42 (1994) No. 9, pp. 2999-3008
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