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Scalable parallel Monte Carlo algorithm for atomistic simulations of precipitation in alloys

B. Sadigh ; Paul Erhart (Institutionen för teknisk fysik, Material- och ytteori) ; A. Stukowski ; A. Caro ; E. Martinez ; L. Zepeda-Ruiz
Physical Review B (1098-0121). Vol. 85 (2012), 18,
[Artikel, refereegranskad vetenskaplig]

We present an extension of the semi-grand-canonical (SGC) ensemble that we refer to as the variance-constrained semi-grand-canonical (VC-SGC) ensemble. It allows for transmutation Monte Carlo simulations of multicomponent systems in multiphase regions of the phase diagram and lends itself to scalable simulations on massively parallel platforms. By combining transmutation moves with molecular dynamics steps, structural relaxations and thermal vibrations in realistic alloys can be taken into account. In this way, we construct a robust and efficient simulation technique that is ideally suited for large-scale simulations of precipitation in multicomponent systems in the presence of structural disorder. To illustrate the algorithm introduced in this work, we study the precipitation of Cu in nanocrystalline Fe.

Nyckelord: Monte Carlo, molecular dynamics, statistical mechanics, statistical ensembles, computer simulations, parallel computing, Fe-Cu, alloys



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Denna post skapades 2012-06-11. Senast ändrad 2014-09-02.
CPL Pubid: 158722

 

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