On the site preferences of ternary additions to triple defect B2 intermetallic compounds

Book · Tue Oct 01 04:00:00 EDT 1996

OSTI ID:367623

Pike, L M; Chen, S L; Chang, Y A ^[1]; Kao, C R ^[2]

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1. Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering
2. National Central Univ., Chung Li (Taiwan, Province of China). Dept. of Chemical Engineering

Knowledge of the site preference of ternary solute additions is essential to developing an understanding of how these solutes affect the properties of B2 intermetallic compounds. A quasichemical model will be presented which is able to predict the site preferences of dilute solute additions to triple defect B2 compounds. The only parameters required are enthalpies of formation at the stoichiometric composition. General equations are developed which can be used to determine site occupations and defect concentrations for dilute as well as non-dilute solute additions. These equations use atom pair bond enthalpies as the parameters. It is found that the site preferences of dilute additions are not always in agreement with predictions based on the solubility lobes in ternary Gibbs isotherms. Predictions for dilute additions to NiAl and FeAl are compared to experimental results found in the literature. Satisfactory correlation is found between the model and the experimental results. In addition, the predictions from the model on vacancy concentrations in Fe doped NiAl are compared to recent experimental results by the authors.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 367623
• Report Number(s): CONF-960202--; ISBN 0-87339-310-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHEMICAL COMPOSITION
CHROMIUM ADDITIONS
COBALT ADDITIONS
COMPARATIVE EVALUATIONS
COPPER ADDITIONS
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
FORMATION HEAT
INTERMETALLIC COMPOUNDS
IRON ADDITIONS
IRON ALLOYS
MANGANESE ADDITIONS
MATHEMATICAL MODELS
METALLURGICAL EFFECTS
NICKEL ALLOYS
PALLADIUM ADDITIONS
TITANIUM ADDITIONS
VACANCIES
VANADIUM ADDITIONS