The kinetics of heterogeneous nucleation and growth: an approach based on a grain explicit model

A model for phase transitions initiated on grain boundaries is proposed and tested against numerical simulations: this approach, based on a grain explicit model, allows us to consider the granular structure, resulting in accurate predictions for a wide span of nucleation processes. Comparisons are m...

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Bibliographic Details
Published in:Modelling and simulation in materials science and engineering 2014-04, Vol.22 (3), p.35018-9
Main Authors: Rouet-Leduc, B, Maillet, J-B, Denoual, C
Format: Article
Language:English
Subjects:
analytical methods
Computer simulation
Grain boundaries
Grains
kinetics
Mathematical models
microstructure
Nucleation
Phase transformations
recrystallization
USSR
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Summary:A model for phase transitions initiated on grain boundaries is proposed and tested against numerical simulations: this approach, based on a grain explicit model, allows us to consider the granular structure, resulting in accurate predictions for a wide span of nucleation processes. Comparisons are made with classical models of homogeneous (JMAK: Johnson and Mehl 1939 Trans. Am. Inst. Min. Eng. 135 416; Avrami 1939 J. Chem. Phys. 7 1103; Kolmogorov 1937 Bull. Acad. Sci. USSR, Mat. Ser. 1 335) as well as heterogeneous (Cahn 1996 Thermodynamics and Kinetics of Phase Transformations Im et al (Pittsburgh: Materials Research Society)) nucleation. A transition scale based on material properties is proposed, allowing us to discriminate between random and site-saturated regimes. Finally, we discuss the relationship between an Avrami-type exponent and the transition regime, establishing conditions for its extraction from experiments.
ISSN:0965-0393
1361-651X
DOI:10.1088/0965-0393/22/3/035018