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Statements

Subject Item
n2:RIV%2F68081723%3A_____%2F11%3A00363693%21RIV12-AV0-68081723
rdf:type
skos:Concept n12:Vysledek
dcterms:description
Diffusion in solids is a well-known phenomenon that has many consequences in technology and material science. Modelling of diffusion- controlled processes requires both a reliable theory of diffusion and reliable kinetic coefficients, as well as other thermodynamic data. Often the classical Darken theory, valid for stress-free systems with ideal vacancy source and sink activity, is generalized to multicomponent systems with ideal vacancy source and sink activity. Nazarov and Gurov presented a theory for stress-free systems with no vacancy source and sink activity. Recently we published a general theory of diffusion that accounted for the role of non-ideal vacancy source and sink activity, as well as the stress state. Since diffusion theories are tested and diffusion coefficients measured usually on diffusion couples, this paper presents evolution equations based on that general theory for a diffusion couple. In the limit, the equations of the Darken theory and the Nazarov and Gurov theory are valid for ideal vacancy source and sink activity and no vacancy source and sink activity, respectively. Simulations for binary and ternary diffusion couples demonstrate the influence of the vacancy source and sink activity and the stress state on evolution of site fraction profiles of components and vacancies, and on the Kirkendall effect. Diffusion in solids is a well-known phenomenon that has many consequences in technology and material science. Modelling of diffusion- controlled processes requires both a reliable theory of diffusion and reliable kinetic coefficients, as well as other thermodynamic data. Often the classical Darken theory, valid for stress-free systems with ideal vacancy source and sink activity, is generalized to multicomponent systems with ideal vacancy source and sink activity. Nazarov and Gurov presented a theory for stress-free systems with no vacancy source and sink activity. Recently we published a general theory of diffusion that accounted for the role of non-ideal vacancy source and sink activity, as well as the stress state. Since diffusion theories are tested and diffusion coefficients measured usually on diffusion couples, this paper presents evolution equations based on that general theory for a diffusion couple. In the limit, the equations of the Darken theory and the Nazarov and Gurov theory are valid for ideal vacancy source and sink activity and no vacancy source and sink activity, respectively. Simulations for binary and ternary diffusion couples demonstrate the influence of the vacancy source and sink activity and the stress state on evolution of site fraction profiles of components and vacancies, and on the Kirkendall effect.
dcterms:title
Modelling of the Influence of Sources and Sinks for Vacancies and Stress State on Diffusion in Crystalline Solids Modelling of the Influence of Sources and Sinks for Vacancies and Stress State on Diffusion in Crystalline Solids
skos:prefLabel
Modelling of the Influence of Sources and Sinks for Vacancies and Stress State on Diffusion in Crystalline Solids Modelling of the Influence of Sources and Sinks for Vacancies and Stress State on Diffusion in Crystalline Solids
skos:notation
RIV/68081723:_____/11:00363693!RIV12-AV0-68081723
n12:predkladatel
n16:ico%3A68081723
n4:aktivita
n7:Z n7:P
n4:aktivity
P(GAP204/10/1784), Z(AV0Z20410507)
n4:cisloPeriodika
3
n4:dodaniDat
n10:2012
n4:domaciTvurceVysledku
n8:5463009
n4:druhVysledku
n18:J
n4:duvernostUdaju
n5:S
n4:entitaPredkladatele
n11:predkladatel
n4:idSjednocenehoVysledku
213121
n4:idVysledku
RIV/68081723:_____/11:00363693
n4:jazykVysledku
n14:eng
n4:klicovaSlova
Substitutional diffusion; Vacancies; Annihilation
n4:klicoveSlovo
n9:Substitutional%20diffusion n9:Vacancies n9:Annihilation
n4:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n4:kontrolniKodProRIV
[67F46C236A18]
n4:nazevZdroje
Acta Materialia
n4:obor
n15:BJ
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
2
n4:projekt
n19:GAP204%2F10%2F1784
n4:rokUplatneniVysledku
n10:2011
n4:svazekPeriodika
59
n4:tvurceVysledku
Svoboda, Jiří Fischer, F. D.
n4:wos
000286690100036
n4:zamer
n17:AV0Z20410507
s:issn
1359-6454
s:numberOfPages
8