On the meaning of the impingement parameter in kinetic equations of diffusion controlled reactions
On the meaning of the impingement parameter in kinetic equations of diffusion controlled reactions
If certain preconditions are met, the Johnson-Mehl-Avrami-Kolmogorov (JMAK) kinetic equation is exactly accurate for nucleation and growth reactions with linear growth and is, at least, a good approximation for nucleation and growth reactions with parabolic growth. These preconditions include randomly distributed product phases, isotropic growth and constant equilibrium state. Mechanisms causing deviations from these preconditions include: capillarity effect, vacancy annihilation, blocking due to anisotropic growth. It is shown that deviations lead to a modification of the overall transformation, which can be approximated well by a single equation. ...... The factors which influence the impingement parameter are discussed.
precipitation, kinetics, diffusion, JMAK, model
4433-4441
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
2001
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Starink, M.J.
(2001)
On the meaning of the impingement parameter in kinetic equations of diffusion controlled reactions.
Journal of Materials Science, 36 (18), .
(doi:10.1023/A:1017974517877).
Abstract
If certain preconditions are met, the Johnson-Mehl-Avrami-Kolmogorov (JMAK) kinetic equation is exactly accurate for nucleation and growth reactions with linear growth and is, at least, a good approximation for nucleation and growth reactions with parabolic growth. These preconditions include randomly distributed product phases, isotropic growth and constant equilibrium state. Mechanisms causing deviations from these preconditions include: capillarity effect, vacancy annihilation, blocking due to anisotropic growth. It is shown that deviations lead to a modification of the overall transformation, which can be approximated well by a single equation. ...... The factors which influence the impingement parameter are discussed.
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MEANING_OF_THE_IMPINGEMENT_PARAMETER.pdf
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Published date: 2001
Keywords:
precipitation, kinetics, diffusion, JMAK, model
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Local EPrints ID: 18827
URI: http://eprints.soton.ac.uk/id/eprint/18827
ISSN: 0022-2461
PURE UUID: 12cbf691-a7d7-4b57-b8eb-82736a3cd97e
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Date deposited: 09 Dec 2005
Last modified: 15 Mar 2024 06:08
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