Effects of anisotropic growth on the deviations from Johnson-Mehl-Avrami kinetics

Feng Liu; Gencang Yang

doi:10.1016/j.actamat.2006.10.022

Effects of anisotropic growth on the deviations from Johnson-Mehl-Avrami kinetics

Feng Liu, Gencang Yang

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

The effects of nucleation, growth and impingement on deviations from classical Johnson-Mehl-Avrami (JMA) kinetics are described. On the basis of Monte Carlo (MC) simulations of isothermal phase transformations, the deviations from the JMA kinetics due to the effects of anisotropic growth have been investigated further. An analytical approach has been adopted to describe phase transformations subjected to the effects of anisotropic growth. In combination with MC simulations, the effect of the "memory" time has been shown when the transition from JMA behavior to blocking behavior occurs during the transformation. On this basis, a physically realistic Avrami exponent has been deduced. A comparative study between the analytical description and a gamma-alpha transformation occurring in an Fe-Mn alloy under an applied load has been carried out.

Original language	English
Pages (from-to)	1629-1639
Number of pages	11
Journal	Acta Materialia
Volume	55
Issue number	5
DOIs	https://doi.org/10.1016/j.actamat.2006.10.022
State	Published - Mar 2007

Keywords

Anisotropic growth
Avrami exponent
JMA kinetics

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10.1016/j.actamat.2006.10.022

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abstract = "The effects of nucleation, growth and impingement on deviations from classical Johnson-Mehl-Avrami (JMA) kinetics are described. On the basis of Monte Carlo (MC) simulations of isothermal phase transformations, the deviations from the JMA kinetics due to the effects of anisotropic growth have been investigated further. An analytical approach has been adopted to describe phase transformations subjected to the effects of anisotropic growth. In combination with MC simulations, the effect of the {"}memory{"} time has been shown when the transition from JMA behavior to blocking behavior occurs during the transformation. On this basis, a physically realistic Avrami exponent has been deduced. A comparative study between the analytical description and a gamma-alpha transformation occurring in an Fe-Mn alloy under an applied load has been carried out.",

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AB - The effects of nucleation, growth and impingement on deviations from classical Johnson-Mehl-Avrami (JMA) kinetics are described. On the basis of Monte Carlo (MC) simulations of isothermal phase transformations, the deviations from the JMA kinetics due to the effects of anisotropic growth have been investigated further. An analytical approach has been adopted to describe phase transformations subjected to the effects of anisotropic growth. In combination with MC simulations, the effect of the "memory" time has been shown when the transition from JMA behavior to blocking behavior occurs during the transformation. On this basis, a physically realistic Avrami exponent has been deduced. A comparative study between the analytical description and a gamma-alpha transformation occurring in an Fe-Mn alloy under an applied load has been carried out.

KW - Anisotropic growth

KW - Avrami exponent

KW - JMA kinetics

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JO - Acta Materialia

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Effects of anisotropic growth on the deviations from Johnson-Mehl-Avrami kinetics

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Keywords

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