Chemical order relaxation in a substitutional solid alloy around the critical temperature

The relaxation rate for phase transformations depends on how the system is far from its thermodynamic equilibrium. If, for example, temperature in the system approaches to the phase transition point, the relaxation rate becomes close to zero. We theoretically investigate the laser-induced kinetics o...

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Bibliographic Details
Published in:Physical review. B 2021-03, Vol.103 (10), p.1, Article 104207
Main Author: Polushkin, Nikolay I.
Format: Article
Language:English
Subjects:
Alloying
Alloys
Binary alloys
Critical temperature
Free energy
Mathematical analysis
Order parameters
Order-disorder transformations
Phase transitions
Short pulses
Taylor series
Temperature
Thermodynamic equilibrium
Thickness
Thin films
Transition points
Transition temperature
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Summary:The relaxation rate for phase transformations depends on how the system is far from its thermodynamic equilibrium. If, for example, temperature in the system approaches to the phase transition point, the relaxation rate becomes close to zero. We theoretically investigate the laser-induced kinetics of chemical order-disorder transformations (CODTs) in substitutional solid alloys at temperatures T satisfying the condition that |T–Tc|≪Tc, where Tc is the CODT critical temperature. In these studies, we use the equation obtained by Metiu, Kitahara, and Ross, that is, dη/dt=–(Γ/2kBT)∂F/∂η, where 0
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.103.104207