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Träfflista för sökning "WFRF:(Razumovskiy Vsevolod. I.) srt2:(2013)"

Search: WFRF:(Razumovskiy Vsevolod. I.) > (2013)

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1.
  • Gorbatov, Oleg I., et al. (author)
  • Role of magnetism in Cu precipitation in alpha-Fe
  • 2013
  • In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 88:17, s. 174113-
  • Journal article (peer-reviewed)abstract
    • The temperature-dependent solubility of Cu in alpha-Fe and initial stages of Cu precipitation are investigated in first-principles calculations and statistical thermodynamic and kinetic modeling based on ab initio effective interactions. We demonstrate that the weakening of the phase separation tendency with increasing temperature, especially close to the magnetic phase transition, is related to the strong dependence of the "chemical" interactions on the global magnetic state. At the same time, our calculations demonstrate that the vibrational contribution obtained in the quasiharmonic approximation is relatively small for temperatures near the Curie point. The results of Monte Carlo simulations of Cu solubility and clustering are in good agreement with experimental data.
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2.
  • Razumovskiy, Vsevolod I., et al. (author)
  • Vacancy-cluster mechanism of metal-atom diffusion in substoichiometric carbides
  • 2013
  • In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 87:5, s. 054203-
  • Journal article (peer-reviewed)abstract
    • We find, using ab initio atomistic simulations of vacancy-mediated diffusion processes in TiC and ZrC, that a multivacancy self-diffusion mechanism is operative for metal-atom diffusion in substoichiometric carbides. It involves a special type of a stable point defect, a metal vacancy "dressed" in a shell of carbon vacancies. We show that this vacancy cluster is strongly bound and can propagate through the lattice without dissociating.
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