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Statements

Subject Item
n2:RIV%2F68081723%3A_____%2F13%3A00435008%21RIV15-GA0-68081723
rdf:type
skos:Concept n15:Vysledek
dcterms:description
A computational framework for the discrete dislocation dynamics simulation of body-centered cubic (bcc) metals which incorporates atomistic simulation results is developed here on the example of tungsten. Mobility rules for the a/2h111i screw dislocations are based on the kink-pair mechanism. The fundamental physical quantity controlling the kink-pair nucleation, the stress-dependent activation enthalpy, is obtained by fitting the line-tension model to atomistic data extending the approach by Gröger et al. (2008a,b) and Gröger and Vitek (2008c). In agreement with atomistic simulation, kink-pair nucleation is assumed to occur only on f110g planes. It is demonstrated that slip of the crystal along high-index planes like f112g which is often observed in experiments is obtained by the glide of the dislocation on two or more f110g planes. It is shown that such an atomistic based description of the dislocation mobility provides a physical basis to naturally explain many experimentally observed phenomena in bcc metals like the tension–compression asymmetry, the orientation dependence of loading, temperature dependence of yield stress and the crystallography of slip. A computational framework for the discrete dislocation dynamics simulation of body-centered cubic (bcc) metals which incorporates atomistic simulation results is developed here on the example of tungsten. Mobility rules for the a/2h111i screw dislocations are based on the kink-pair mechanism. The fundamental physical quantity controlling the kink-pair nucleation, the stress-dependent activation enthalpy, is obtained by fitting the line-tension model to atomistic data extending the approach by Gröger et al. (2008a,b) and Gröger and Vitek (2008c). In agreement with atomistic simulation, kink-pair nucleation is assumed to occur only on f110g planes. It is demonstrated that slip of the crystal along high-index planes like f112g which is often observed in experiments is obtained by the glide of the dislocation on two or more f110g planes. It is shown that such an atomistic based description of the dislocation mobility provides a physical basis to naturally explain many experimentally observed phenomena in bcc metals like the tension–compression asymmetry, the orientation dependence of loading, temperature dependence of yield stress and the crystallography of slip.
dcterms:title
Dislocation motion in tungsten: Atomistic input to discrete dislocation simulations Dislocation motion in tungsten: Atomistic input to discrete dislocation simulations
skos:prefLabel
Dislocation motion in tungsten: Atomistic input to discrete dislocation simulations Dislocation motion in tungsten: Atomistic input to discrete dislocation simulations
skos:notation
RIV/68081723:_____/13:00435008!RIV15-GA0-68081723
n4:aktivita
n7:P n7:I
n4:aktivity
I, P(ED1.1.00/02.0068), P(GAP204/10/0255)
n4:cisloPeriodika
AUG
n4:dodaniDat
n6:2015
n4:domaciTvurceVysledku
n18:9482725
n4:druhVysledku
n9:J
n4:duvernostUdaju
n12:S
n4:entitaPredkladatele
n17:predkladatel
n4:idSjednocenehoVysledku
69893
n4:idVysledku
RIV/68081723:_____/13:00435008
n4:jazykVysledku
n14:eng
n4:klicovaSlova
body-centered cubic; non-Schmid effects; anomalous slip; discrete dislocation dynamics
n4:klicoveSlovo
n5:body-centered%20cubic n5:anomalous%20slip n5:non-Schmid%20effects n5:discrete%20dislocation%20dynamics
n4:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n4:kontrolniKodProRIV
[F8475E76E749]
n4:nazevZdroje
International Journal of Plasticity
n4:obor
n16:BM
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
4
n4:projekt
n8:ED1.1.00%2F02.0068 n8:GAP204%2F10%2F0255
n4:rokUplatneniVysledku
n6:2013
n4:svazekPeriodika
47
n4:tvurceVysledku
Srivastava, K. Gröger, Roman Weygand, D. Gumbsch, P.
n4:wos
000321410200008
s:issn
0749-6419
s:numberOfPages
17
n10:doi
10.1016/j.ijplas.2013.01.014