Diffusion zone formation in aluminized MAR-247 from Bi-velocity Phase Field Method

Bartek Wierzba and Katarzyna Tkacz-Śmiech

Physica A: Statistical Mechanics and its Applications, 2013, vol. 392, issue 5, 1100-1110

Abstract: The Bi-velocity Phase Field Method (BPFM), which allows a quantitative description of diffusion mass transport in multi-phase materials, is presented and applied to simulate formation of a diffusion zone in aluminized MAR-247. The method links the bi-velocity Darken approach with the phase-field model in which the diffusion zone is quantitatively characterized by phase volume fractions. Accordingly, composition dependent diffusivities in a two-phase region are defined. The present method allows calculation of element-distribution profiles and volume fractions of the phases across a diffusion couple. Hence, a diffusion path can be determined for three component systems and, besides, the average stress field and entropy production during diffusion can be calculated.

Keywords: Bi-velocity; Phase field; Interdiffusion; Diffusion path; Entropy; NiCrAl ternary system (search for similar items in EconPapers)
Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:392:y:2013:i:5:p:1100-1110

DOI: 10.1016/j.physa.2012.11.011

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