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- Title
Diffusion across the interface and equilibrium and growth of phases in alloys.
- Authors
Gordillo, Jorge A.
- Abstract
A model describing diffusion across interfaces and civilian transformations in substitutional alloys under isobaric conditions was developed. The model is based on the concept of an ideal alloy. It is postulated that the migration process through the interfaces involves point defects present on the surfaces contiguous to the interfaces. In this way, jumps frequency, from one phase to the other, would be determined by the probability that a particle finds one of these defects and by the probability that the jump has enough energy. The equations of this theoretical model were validated with empirical results. With this model, a new stability criterion was found. It is postulated that equilibrium exists in 2 phases when it is fulfilled that the flow of its components through the interfaces is null, and that the interfaces of each of the phases are at a value of minimum energy. And in the case that the functions are differentiable and that the previous condition is fulfilled, this equilibrium is stable for the case in which its first derivatives with respect to its components is less than or equal to zero. This model could also be applied to describe alloys with more than 2 phases, and more components or materials with a single phase and a single component.
- Subjects
PHASE equilibrium; ALLOYS; DIFFERENTIABLE functions; POINT defects; STABILITY criterion
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 6, p2534
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-023-09286-6