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A new model for diffusion-controlled precipitation reactions using the extended volume concept

A new model for diffusion-controlled precipitation reactions using the extended volume concept
A new model for diffusion-controlled precipitation reactions using the extended volume concept
In this work a new model for diffusion-controlled precipitation reactions is derived, analysed and tested against a wide range of data. The model incorporates elements of the extended volume concept and combines this with a new treatment of soft impingement of diffusion fields. The model derivation involves an integration over iso-concentration regions in the parent phase in the extended volume, which leads to a single analytical equation describing the relation the fraction transformed, ?, and the extended volume fraction, ?ext, as:


? = {exp(-2?ext)-1}/(2?ext) + 1.

The model is compared to a range of new and old data on diffusion-controlled reactions including precipitation reactions and exsolution reactions, showing a very good performance, outperforming classical and recent models. The model allows new interpretation of existing data which, for the first time, show a consistent analysis, in which Avrami constants, n, equal values that are always consistent with transformation theory.
kinetic model, diffusion-controlled reactions, nucleation and growth, precipitation kinetics, impingement
0040-6031
109-119
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51

Starink, M.J. (2014) A new model for diffusion-controlled precipitation reactions using the extended volume concept. Thermochimica Acta, 596, 109-119. (doi:10.1016/j.tca.2014.09.016).

Record type: Article

Abstract

In this work a new model for diffusion-controlled precipitation reactions is derived, analysed and tested against a wide range of data. The model incorporates elements of the extended volume concept and combines this with a new treatment of soft impingement of diffusion fields. The model derivation involves an integration over iso-concentration regions in the parent phase in the extended volume, which leads to a single analytical equation describing the relation the fraction transformed, ?, and the extended volume fraction, ?ext, as:


? = {exp(-2?ext)-1}/(2?ext) + 1.

The model is compared to a range of new and old data on diffusion-controlled reactions including precipitation reactions and exsolution reactions, showing a very good performance, outperforming classical and recent models. The model allows new interpretation of existing data which, for the first time, show a consistent analysis, in which Avrami constants, n, equal values that are always consistent with transformation theory.

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Starink - Thermochim Acta 2014.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 27 September 2014
e-pub ahead of print date: 5 October 2014
Published date: 2014
Additional Information: http://authors.elsevier.com/a/1Pv1i9EscBz~b
Keywords: kinetic model, diffusion-controlled reactions, nucleation and growth, precipitation kinetics, impingement
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 369478
URI: http://eprints.soton.ac.uk/id/eprint/369478
ISSN: 0040-6031
PURE UUID: f6f19579-e3bd-4059-a77e-bc9b9e45d9f4

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Date deposited: 02 Oct 2014 11:54
Last modified: 14 Mar 2024 18:04

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