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Thermodynamic considerations in the analysis of phase stability: The role of interfacial equilibrium in the determination of phase diagrams by X-ray microanalytical techniques

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Bulletin of Alloy Phase Diagrams

Abstract

Although the time required for full equilibration may be too long to attain experimentally, equilibrium tie lines between coexisting phases can be determined from unequilibrated alloys and multiphase diffusion couples if the compositions of the two phases coexisting at the interface can be resolved, assuming that the interface is in “local equilibrium”. The capability to examine elemental segregation on a fine spatial scale allows for more rigorous testing of the assumption of local equilibrium at phase interfaces and for the determination of phase equilibria at temperatures below those accessible with more conventional techniques.

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Authors and Affiliations

  1. Sandia National Laboratories, 87185, Albuquerque, NM

    A. D. Romig

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This work was performed at Sandia National Laboratories, supported by the U.S. Department of Energy under contract No. DE-AC04-76DP00789.

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Romig, A.D. Thermodynamic considerations in the analysis of phase stability: The role of interfacial equilibrium in the determination of phase diagrams by X-ray microanalytical techniques. Bulletin of Alloy Phase Diagrams 8, 308–322 (1987). https://doi.org/10.1007/BF02869262

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