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

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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 ... continued below

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15 p.

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Pike, L.M.; Chen, S.L. & Chang, Y.A. December 31, 1995.

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Description

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.

Physical Description

15 p.

Notes

OSTI as DE96009723

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  • The Minerals, Metals and Materials Society (TMS) symposium on design fundamentals of high temperature composites, intermetallics, and metal-ceramics systems, Anaheim, CA (United States), 1995

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  • Other: DE96009723
  • Report No.: CONF-950008--1
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 216302
  • Archival Resource Key: ark:/67531/metadc665574

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 19, 2016, 8:48 p.m.

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Pike, L.M.; Chen, S.L. & Chang, Y.A. On the site preferences of ternary additions to triple defect B2 intermetallic compounds, article, December 31, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc665574/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.