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• W2168492790 abstract "A phenomenological modelling approach has been developed to describe the massive transformation and the formation of lamellar microstructures during cooling in binary γ titanium aluminides. The modelling approach is based on a combination of nucleation and growth laws which take into account the specific mechanisms of each phase transformation. Nucleation of massive and lamellar γ is described with classical nucleation theory, accounting for the fact that nuclei are formed predominantly at α/α grain boundaries. Growth of the massive γ grains is based on theory for interface-controlled reactions. A modified Zener model is used to calculate the thickening rate of the γ lamellar precipitates. The model incorporates the effect of particle impingement and coverage of the nucleation sites by the growing phase. The driving pressures of the phase transformations are obtained from Thermo-Calc based on the actual temperature and matrix composition. CCT diagrams and lamellar spacings calculated with the model are in good agreement with experimental data obtained from dedicated heat treatment experiments and from the literature. The model permitted investigating the influence of cooling rate, alloy chemistry and average α grain size upon the amount of massive γ and the average thickness and spacing of the lamellae. In particular it indicates that the Al depletion of the α phase during lamellar precipitation seems to play an important role in the suppression of the massive transformation at moderate cooling rate and in the large lamellar spacings observed at low cooling rate." @default.
• W2168492790 created "2016-06-24" @default.
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• W2168492790 date "2008-10-01" @default.
• W2168492790 modified "2023-10-03" @default.
• W2168492790 title "A numerical model for the description of the lamellar and massive phase transformations in TiAl alloys" @default.
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• W2168492790 doi "https://doi.org/10.1016/j.intermet.2008.07.008" @default.
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