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Title: Monte Carlo Study of the Growth of L12 ordered domains in fcc A3B binary alloys
Author: Frontera Beccaria, Carlos
Vives i Santa-Eulàlia, Eduard
Castán i Vidal, Maria Teresa
Planes Vila, Antoni
Keywords: Aliatges binaris
Propietats magnètiques
Mètode de Montecarlo
Binary systems (Metallurgy)
Magnetic properties
Monte Carlo method
Issue Date: 1997
Publisher: The American Physical Society
Abstract: A Monte Carlo study of the late time growth of L12-ordered domains in a fcc A3B binary alloy is presented. The energy of the alloy has been modeled by a nearest-neighbor interaction Ising Hamiltonian. The system exhibits a fourfold degenerated ground state and two kinds of interfaces separating ordered domains: flat and curved antiphase boundaries. Two different dynamics are used in the simulations: the standard atom-atom exchange mechanism and the more realistic vacancy-atom exchange mechanism. The results obtained by both methods are compared. In particular we study the time evolution of the excess energy, the structure factor and the mean distance between walls. In the case of atom-atom exchange mechanism anisotropic growth has been found: two characteristic lengths are needed in order to describe the evolution. Contrarily, with the vacancyatom exchange mechanism scaling with a single length holds. Results are contrasted with existing experiments in Cu3Au and theories for anisotropic growth.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 1997, vol. 55, núm. 1, p. 212-225
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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