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ASM Handbook

Alloy Phase Diagrams

Edited by
H. Okamoto
H. Okamoto
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M.E. Schlesinger
M.E. Schlesinger
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E.M. Mueller
E.M. Mueller
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ASM International
Volume
3
ISBN electronic:
978-1-62708-163-4
Publication date:
2016
Book Chapter

Thermodynamics and Phase Diagrams[1]

Published:
2016
Page range:
26 - 36
Publication history
July 07, 2015

Abstract

Thermodynamic descriptions have become available for a large number of alloy systems and allow the calculation of the phase diagrams of multicomponent alloys. This article begins with a discussion on three laws of thermodynamics: the Law of Conservation of Energy, the Second Law of Thermodynamics, and the Third Law of Thermodynamics. It informs that for transformations that occur at a constant temperature and pressure, the relative stability of the system is determined by its Gibbs free energy. The article describes the Gibbs free energy of a single-component unary system and the Gibbs free energy of a binary solution. It schematically illustrates the structure of a binary solid solution with interatomic bonds and shows how the equilibrium state of an alloy can be obtained from the free-energy curves at a given temperature. The article concludes with information on the construction of eutectic and binary phase diagrams from Gibbs free-energy curves.

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2016. "Thermodynamics and Phase Diagrams", Alloy Phase Diagrams, H. Okamoto, M.E. Schlesinger, E.M. Mueller

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