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Phase Field Simulation of Coarsening Kinetics in Al-Sc and Al-Sc-Zr Alloys

Published online by Cambridge University Press:  21 September 2018

H. Zapolsky ,
J. Boisse ,
R. Patte  and
N. Lecoq
H. Zapolsky
Affiliation:
GPM, UMR 6634 CNRS, University of Rouen, Avenue de l'Université, BP 12, 76801 Saint-Etienne du Rouvray , France
J. Boisse
Affiliation:
GPM, UMR 6634 CNRS, University of Rouen, Avenue de l'Université, BP 12, 76801 Saint-Etienne du Rouvray , France
R. Patte
Affiliation:
GPM, UMR 6634 CNRS, University of Rouen, Avenue de l'Université, BP 12, 76801 Saint-Etienne du Rouvray , France
N. Lecoq
Affiliation:
GPM, UMR 6634 CNRS, University of Rouen, Avenue de l'Université, BP 12, 76801 Saint-Etienne du Rouvray , France
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Abstract

The coarsening kinetics of γ’ precipitates in binary and ternary Al3Sc1-xZrx alloys is studied by using the two- and three-dimensional phase-field simulations. Our focus is on the influence of diffusion coefficients of Sc and Zr atoms on the transformation path kinetics from disordered f.c.c. matrix to two phases equilibrium state with γ’ precipitates and f.c.c. disordered matrix. Our simulation results demonstrate that in the case of binary alloys taking into account the concentration dependence of the mobility of atoms decreases the coarsening rate. In the case of ternary alloys we show that the Al3Sc particles precipitate first following by appearance of a Zr-rich shell. Our simulations results are in good agreement with experimental observations.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U09-11
Copyright
Copyright © Materials Research Society 2009

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