Journal
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
Volume 31, Issue 2, Pages 303-312Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.calphad.2006.08.005
Keywords
phase-field modelling; theta ' precipitate; growth kinetics; Al-Cu alloys
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In theoretical analyses and computational simulations chemical free energies of stoichiometric compounds and solid solution phases are often approximated by parabolic functions. In the present work, we focus on examining the effect of different approximations of chemical free energies on predicted precipitate growth kinetics with phase-field modelling. As an example, we studied the precipitation of plate-like theta'(Al2Cu) in Al-4 wt%Cu Alloys. Using six sets of chemical free energies for theta' and Al-Cu solid solution, growth kinetics of theta' precipitates were simulated by assuming either constant diffusivity or constant atomic mobility. It is demonstrated that the parabolic function provides a good description for the chemical free energy of a stoichiometric compound while the growth kinetics is sensitive to the approximation of chemical free energy for the solution phase. Published by Elsevier Ltd.
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