Description of solid phase transformation kinetics at the mesolevel within a constitutive model of the material

2017 ◽  
Author(s):  
E. S. Makarevich ◽  
N. S. Kondratiev ◽  
P. V. Trusov
Keyword(s):  
Phase Transformation ◽  
Constitutive Model ◽  
Solid Phase ◽  
Transformation Kinetics ◽  
Phase Transformation Kinetics ◽  
Solid Phase Transformation

scholarly journals A model for electrochemical insertion limited by a phase transition process - eilpt

2003 ◽  
Vol 39 (1-2) ◽  
pp. 353-368 ◽  
Author(s):  
N. Adhoum ◽  
J. Bouteillon ◽  
D. Dumas ◽  
J.C. Poignet
Keyword(s):  
Phase Transition ◽  
Phase Transformation ◽  
Solid Phase ◽  
Transition Process ◽  
Equilibrium Potential ◽  
Transformation Kinetics ◽  
Electrode Thickness ◽  
Cathodic Material ◽  
Phase Transition Process ◽  
Solid Phase Transformation

This paper deals with electrochemical insertion into a cathodic material. New results on modeling of the influence of a solid phase transformation on the shape of voltamograms are presented. The original experiments concern the insertion of sodium into carbon during the cathodic reduction of molten NaF at 1020 ?C, but in the present manuscript emphasis on the theoretical aspects of the work is put. Phase transformations during electrochemical insertion are taken into account, with various values for parameters such as the thermodynamic biphase equilibrium potential, the compared diffusion and phase transformation kinetics, and the electrode thickness. The voltamograms calculated present very specific features; some of them have already been observed experimentally in literature.

scholarly journals Solid state phase transformation kinetics in Zr-base alloys

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
A. R. Massih ◽  
Lars O. Jernkvist
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Zirconium Alloys ◽  
Excess Oxygen ◽  
Transformation Kinetics ◽  
Fuel Cladding ◽  
Reactor Accident ◽  
Phase Transformation Kinetics ◽  
Solid State Phase Transformation ◽  
Water Reactors

AbstractWe present a kinetic model for solid state phase transformation ($$\alpha \rightleftharpoons \beta$$ α ⇌ β ) of common zirconium alloys used as fuel cladding material in light water reactors. The model computes the relative amounts of $$\beta$$ β or $$\alpha$$ α phase fraction as a function of time or temperature in the alloys. The model accounts for the influence of excess oxygen (due to oxidation) and hydrogen concentration (due to hydrogen pickup) on phase transformation kinetics. Two variants of the model denoted by A and B are presented. Model A is suitable for simulation of laboratory experiments in which the heating/cooling rate is constant and is prescribed. Model B is more generic. We compare the results of our model computations, for both A and B variants, with accessible experimental data reported in the literature covering heating/cooling rates of up to 100 K/s. The results of our comparison are satisfactory, especially for model A. Our model B is intended for implementation in fuel rod behavior computer programs, applicable to a reactor accident situation, in which the Zr-based fuel cladding may go through $$\alpha \rightleftharpoons \beta$$ α ⇌ β phase transformation.

scholarly journals A study on the effect of the number of clusters at the phase transformation kinetics

2021 ◽  
Author(s):  
Nathan Fernandes Ignácio ◽  
Maisa Silva Fernandes ◽  
Diego Magalhães Baía ◽  
Ana Gabriela Conceição dos Santos ◽  
Felipe da Silva Siqueira ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Transformation Kinetics ◽  
Number Of Clusters ◽  
Phase Transformation Kinetics
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