کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1601535 1515891 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Lattice gas decomposition model for vacancy formation correlated with B2 atomic ordering in intermetallics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Lattice gas decomposition model for vacancy formation correlated with B2 atomic ordering in intermetallics
چکیده انگلیسی

Thermal vacancy formation correlated with atomic ordering was modelled in B2-ordering A–B binary intermetallics. Ising Hamiltonian was implemented with a specific Bragg–Williams-type thermodynamic formalism for thermal vacancy formation based on the phase equilibria in a lattice gas composed of atoms and vacancies. It has been demonstrated that for pair-interaction energetics favouring vacancy formation on A-atom sublattice, equilibrium concentrations of vacancies and antisite defects result mutually proportional in well defined temperature ranges. The effect observed in both stoichiometric and non-stoichiometric binary alloys was interpreted as a tendency for triple defect formation. In B-rich non-stoichiometric binary alloys vacancy concentration did not extrapolate to zero at temperature approaching zero, which indicated the formation of constitutional vacancies. Energetic conditions for the occurrence of the effects were analysed in detail.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 17, Issues 1–2, January–February 2009, Pages 46–55
نویسندگان
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