Phase equilibria of the cu-in system II: Thermodynamic assessment and calculation of phase diagram |
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Authors: | C R Kao A Bolccwage S -L Chen S W Chen Y A Chang and A D Romig |
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Affiliation: | (1) Department of Materials Science and Engineering, University of Wisconsin-Madison, University Avenue Madison, 1509, WI 53706;(2) Materials and Process Sciences Center, Sandia National Laboratories Albuquerque, 87185, JVM |
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Abstract: | The phases in the Cu-In binary were modelled thermodynamically using the Redlich-Kister expression for the Gibbs energies
of the solution phases, the Wagner-Schottky model for those of the η (η)’)-Cu2ln phase (taking η and η)’ to be a single phase), and assuming line compound behavior for the other intermetallic phases.
The model parameters were obtained using primarily the thermodynamic data, as well as the phase equilibrium data. The thermodynamic
values for the various phases calculated from the models are in reasonable agreement with the experimentally determined thermodynamic
data that are available in the literature. The entropies of melting for the intermetallic phases obtained from the models
are in accord with the values calculated from the empirical formulas suggested by Kubaschewski.
The calculated phase diagram is also in reasonable agreement with the experimentally determined diagram, with the calculated
temperatures for all the invariant equilibria within 1°C of the experimental values. The discrepancies between the calculated
and experimental phase boundaries at the invariant temperatures are less than 1 at.% except those involving βCu4Inn and γCu7ln3. These two phases were taken to be line compounds in the present study, although experimentally they exist over appreciable
ranges of homogeneity.
Current address: Dept. of Chemical Engineering, National Tsing Hua University, Taiwan. |
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