Heat storage in eutectic alloys |
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Authors: | Birchenall C Ernest Riechman Alan F |
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Affiliation: | (1) Department of Chemical Engineering, University of Delaware, 19711 Newark, DE;(2) E. I. duPont de Nemours and Co., Inc., 77704 Beaumont, TX |
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Abstract: | Classical thermodynamic equations based on the regular solution approximation yield enthalpic changes for eutectic transformation
that agree roughly with values measured for several binary and ternary alloy systems by differential scanning calorimetry
or differential thermal analysis. Restricting measurements to binary and ternary alloys of the relatively plentiful elements
Al, Cu, Mg, Si and Zn, it has been verified that the best heat storage densities on a mass or volume basis are obtained with
alloys rich in Si or Al, elements that have large heats of fusion. Several of these alloys have the highest heat-storage density
reported for phase change materials that transform between 780 and 850 K. The Mg2Si-Si eutectic, which has outstanding storage density at 1219 K, illustrates the utility of ordered intermetallic phases with
large heat of formation that dissolve in the eutectic liquid to contribute to the entropy change. |
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