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Phase-field simulation of sintering and related phenomena: A vacancy diffusion approach
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.ORCID-id: 0000-0002-4521-6089
2006 (engelsk)Inngår i: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 54, s. 1241-1248Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A phase-field model of sintering and related phenomena in a two-phase system and in a multi-phase system is presented. We consider diffusion of vacancies as the atomic mechanism for redistribution of material and we will use the familiar model of thermal vacancies in a crystal as our energy formulation. The solid material will thus be characterized by a low vacancy content and the surroundings by a very high vacancy content and a very low content of atoms. The surface of the solid body will be characterized by a continuous variation in vacancy content. The temporal development of particles during solid state sintering with effects such as wetting is shown in various simulations.

sted, utgiver, år, opplag, sider
2006. Vol. 54, s. 1241-1248
Emneord [en]
Sintering; Phase-field models; Surface energy; Dihedral angle
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-11081DOI: 10.1016/j.actamat.2005.11.005ISI: 000235765300005Scopus ID: 2-s2.0-31944446620OAI: oai:DiVA.org:kth-11081DiVA, id: diva2:235438
Merknad
QC 20100622Tilgjengelig fra: 2009-09-16 Laget: 2009-09-16 Sist oppdatert: 2017-12-13bibliografisk kontrollert
Inngår i avhandling
1. Phase-field modeling of surface-energy driven processes
Åpne denne publikasjonen i ny fane eller vindu >>Phase-field modeling of surface-energy driven processes
2009 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Surface energy plays a major role in many phenomena that are important in technological and industrial processes, for example in wetting, grain growth and sintering. In this thesis, such surface-energy driven processes are studied by means of the phase-field method. The phase-field method is often used to model mesoscale microstructural evolution in materials. It is a diffuse interface method, i.e., it considers the surface or phase boundary between two bulk phases to have a non-zero width with a gradual variation in physical properties such as energy density, composition and crystalline structure.

Neck formation and coarsening are two important diffusion-controlled features in solid-state sintering and are studied using our multiphase phase-field method. Inclusion of Navier-Stokes equation with surface-tension forces and convective phase-field equations into the model, enables simulation of reactive wetting and liquid-phase sintering. Analysis of a spreading liquid on a surface is investigated and is shown to follow the dynamics of a known hydrodynamic theory. Analysis of important capillary phenomena with wetting and motion of two particles connected by a liquid bridge are studied in view of important parameters such as contact angles and volume ratios between the liquid and solid particles.

The interaction between solute atoms and migrating grain boundaries affects the rate of recrystallization and grain growth. The phenomena is studied using a phase-field method with a concentration dependent double-well potential over the phase boundary. We will show that with a simple phase-field model it is possible to model the dynamics of grain-boundary segregation to a stationary boundary as well as solute drag on a moving boundary.

Another important issue in phase-field modeling has been to develop an effective coupling of the phase-field and CALPHAD methods. Such coulping makes use of CALPHAD's thermodynamic information with Gibbs energy function in the phase-field method. With the appropriate thermodynamic and kinetic information from CALPHAD databases, the phase-field method can predict mictrostructural evolution in multicomponent multiphase alloys. A phase-field model coupled with a TQ-interface available from Thermo-Calc is developed to study spinodal decomposition in FeCr, FeCrNi and TiC-ZrC alloys.

sted, utgiver, år, opplag, sider
Stockholm: KTH, Materialvetenskap, 2009. s. 32
Emneord
Phase-field method, surface energy, solute drag, solid-state sintering, multicomponent multiphase flow, wetting, liquid-phase sintering, spinodal decomposition, CALPHAD
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-11036 (URN)978-91-7415-426-9 (ISBN)
Disputas
2009-10-02, F3, Lindstedsvägen 26, KTH, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad
QC 20100622Tilgjengelig fra: 2009-09-16 Laget: 2009-09-10 Sist oppdatert: 2010-07-19bibliografisk kontrollert

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