Тип публикации: статья из журнала
Год издания: 2002
Ключевые слова: Statistical-thermodynamic model, D03-phases, point defects, Thermodynamic activities, Fe3Al, Ni3Sb, entire function, logarithmic residue, resultant
Аннотация: A statistical-thermodynamic model for binary non-stoichiometric D03-phases has been developed based on a mean-field approximation. The corresponding D03 crystal lattice is divided into three sublattices, the α-, β- and γ-sublattices, where A-atoms occupy the α- and γ-sublattices, and B-atoms occupy the β-sublattice in the perfectlyПоказать полностьюordered case. Neglecting interstitial defects, all other possible point defects, i.e. anti-structure atoms and vacancies on all three sublattices are considered. Based on a grand-canonical approach the expressions for the defect concentrations are derived as functions of composition and temperature, and from these the thermodynamic activities of the two components can be calculated using energies of formation of the six types of point defects as parameters. The model equations are applied to the two intermetallic phases Fe3Al (at 500 K) and Ni3Sb (at 1200 K).
Журнал: Journal of Alloys and Compounds
Выпуск журнала: Т. 338, № 1-2
Номера страниц: 20-25
ISSN журнала: 09258388
Издатель: Elsevier Science Publishing Company, Inc.