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Kinetics of Disorder →Order Transformations: Thermodynamic Theory Versus Kinetic Rate Theory

Fultz, Brent (1994) Kinetics of Disorder →Order Transformations: Thermodynamic Theory Versus Kinetic Rate Theory. In: Statics and Dynamics of Alloy Phase Transformations. NATO ASI Series. No.319. Springer , Boston, MA, pp. 669-672. ISBN 9781461360551.

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In alloys near thermodynamic equilibrium, the state variables change slowly enough so that the alloy is able to sample all microstates available to it. The entropy is well-defined. It is not surprising, although not strictly necessary, for the kinetics to follow the steepest gradient of the free energy function. Far from thermodynamic equilibrium, however, we expect the free energy function to be less useful. An internal energy can be defined, of course, and an entropy can be defined, for example, by counting the microstates accessible to a corresponding system having the same state variables, but in equilibrium at a different temperature. During the kinetic evolution of the alloy, however, not all of these microstates are encountered with equal probability. No physical mechanism of atom movement allows for direct transitions between arbitrary pairs of microstates. If many elementary kinetic events are required for the system to pass from one specific state to another, the internal energy may have already begun to relax before the microstates of the second state are adequately sampled.

Item Type:Book Section
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URLURL TypeDescription
Fultz, Brent0000-0002-6364-8782
Additional Information:© Springer Science+Business Media New York 1994. This work was supported by a Grant for International Research from NEDO, Japan, and the U. S. Department of Energy under contract DE-FG03-86ER45270.
Funding AgencyGrant Number
New Energy and Industrial Technology Development Organization (NEDO)UNSPECIFIED
Department of Energy (DOE)DE-FG03-86ER45270
Subject Keywords:Atom Movement; Free Energy Function; Neighbor Pair; Cluster Variation Method; Vacancy Mechanism
Series Name:NATO ASI Series
Issue or Number:319
Record Number:CaltechAUTHORS:20201005-153617648
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105830
Deposited By: George Porter
Deposited On:06 Oct 2020 14:32
Last Modified:06 Oct 2020 14:32

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