Phase separation during the sedimentation process in Cu–Sn alloy

Wierzba, Bartek�; Nowak, W.

doi:10.1016/j.physa.2019.02.041

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…It was shown to be efficient for multicomponent systems where the intrinsic fluxes of each component are coupled through the drift velocity [6,29,30]. This diffusion model, written through the derivative of diffusion potential, may include different driving forces such as mechanical stress induced by gravity [31] necessary to model segregation in multicomponent mixtures under gravity [32]. This driving force coupling brings a strong potentiality to the Darken-based methodology.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of diffusion-controlled phase transformation using the Darken method: Application to the dissolution/precipitation processes in materials

Bordère

Glockner²

2021

Computational Materials Science

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Many material phase transformations are controlled by mass transport induced by diffusion. To better understand such transformations, numerous modeling strategies at the scale of the moving interfaces exist, with their strengths and weaknesses. Phase field approaches are based on diffuse interfaces that do not require any interface tracking, as opposed to those based on fixed-grid sharp interface tracking. In the case of binary two-phase systems, in this paper we address the key point of the mass balance equation at the interface involving a concentration jump, which determines the interface moving velocity. We propose a unique diffusion equation for both phases and their interface, based on the component's chemical potentials which are continuous throughout the interface and a smooth volume-of-fluid phase representation. This model is achieved in the framework of the Darken method, which involves intrinsic diffusion of components and a drift velocity to which all compounds are subjected. This drift velocity is shown to be that of the interface displacement as well. This methodology is verified for 1D and 3D dissolution/precipitation problems and has a first-order spatial convergence. The 3D simulations of precipitation and dissolution processes of more complex microstructures clearly show a bifurcation of the particle morphology from the initial spherical shape when the diffusion edges of each particle interact with each other. An extension of the diffusion potential to mechanical driving forces should make it possible to deal with mechano-chemical coupling of mass transport.

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Section: Introductionmentioning

confidence: 99%

Numerical modeling of diffusion-controlled phase transformation using the Darken method: Application to the dissolution/precipitation processes in materials

Bordère

Glockner²

2021

Computational Materials Science

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“…Phase separation during the sedimentation process in Cu–Tin (Sn) alloy under supergravity was investigated in 2019 by Wierzba et al [ 8 ]. Centrifugal casting is used in industry; the main application is the improvement of the filling of molds [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Non-Equilibrium Crystallization of Monotectic Zn-25%Bi Alloy under 600 g

et al. 2021

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This study investigated the influence of supergravity on the segregation of components in the Zn–Bi monotectic system and consequently, the creation of an interface of the separation zone of both phases. The observation showed that near the separation boundary, in a very narrow area of the order of several hundred microns, all types of structures characteristic for the concentration range from 0 to 100% bismuth occurred. An additional effect of crystallization in high gravity is a high degree of structural order and an almost perfectly flat separation boundary. This is the case for both the zinc-rich zone and the bismuth-rich zone. Texture analysis revealed the existence of two privileged orientations in the zinc zone. Gravitational segregation also resulted in a strong rearrangement of the heavier bismuth to the outer end of the sample, leaving only very fine precipitates in the zinc region. For comparison, the results obtained for the crystallization under normal gravity are given. The effect of high orderliness of the structure was then absent. Despite segregation, a significant part of bismuth remained in the form of precipitates in the zinc matrix, and the separation border was shaped like a lens. The described method can be used for the production of massive bimaterials with a directed orientation of both components and a flat interface between them, such as thermo-generator elements or bimetallic electric cell parts, where the parameters (thickness) of the junction can be precisely defined at the manufacturing stage.

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