Vibrational contribution to the thermodynamics of nanosized precipitates: vacancy-copper clusters in bcc-Fe

Research output: Contribution to journalArticle

Authors

  • Mina Talati
  • Matthias Posselt
  • Giovanni Bonny
  • Ahmed Al-Motasem
  • Frank Bergner

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Abstract

The effects of lattice vibration on the thermodynamics of nanosized coherent clusters in bcc-Fe consisting of vacancies and/or copper are investigated within the harmonic approximation. A combination of on-lattice simulated annealing based on Metropolis Monte Carlo simulations and off-lattice relaxation by molecular dynamics is applied to obtain the most stable cluster configurations at T D 0 K. The most recent interatomic potential built within the framework of the embedded-atom method for the Fe–Cu system is used. The total free energy of pure bcc-Fe and fcc-Cu as well as the total formation free energy and the total binding free energy of the vacancy–copper clusters are determined for finite temperatures. Our results are compared with the available data from previous investigations performed using many-body interatomic potentials and first-principles methods. For further applications in rate theory and object kinetic Monte Carlo simulations, the vibrational effects evaluated in the present study are included in the previously developed analytical fitting formulae.

Details

Original languageEnglish
Pages (from-to)225402-225402
JournalJournal of Physics: Condensed Matter
Volume24
Issue number22
DOIs
Publication statusPublished - 4 May 2012

Keywords

  • vacancy-copper clusters, thermodynamics, vibrational free energy

ID: 194297