Results 161 to 170 of about 1,300,474 (200)
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JAOCS, Journal of the American Oil Chemists' Society, 1998
AbstractThe Avrami model is widely used in the analysis of crystallization kinetic data. Unfortunately, the use of the original model has been abandoned in favor of modified versions. The modifications are largely arbitrary and create a dependence between the Avrami constant and the Avrami exponent.
Alejandro G. Marangoni
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AbstractThe Avrami model is widely used in the analysis of crystallization kinetic data. Unfortunately, the use of the original model has been abandoned in favor of modified versions. The modifications are largely arbitrary and create a dependence between the Avrami constant and the Avrami exponent.
Alejandro G. Marangoni
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Modification of Kolmogorov-Johnson-Mehl-Avrami Equation for Clustered Nucleation
Materials Transactions, 2009 We defined a 3-dimensional local number, LN3D, and its probability distribution to describe the spatial distribution of new grains in phase transformation, and suggested a modification of Kolmogorov-Johnson-Mehl-Avrami (KJMA) equation for clustered nucleation using parameters of the probability distribution of LN3D.
Osamu Yanagisawa, Hiroshi Fukushima
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Effect of impingement of rods on the Avrami equation
Journal of Applied Physics, 1973Phase transformations involving growth and impingement of randomly centered and oriented rods, fixed in number and cross section, have been studied using computer modeling techniques. As expected, the Avrami equation does not adequately describe the process. Deviations of up to 15% from the Avrami predictions are frequently encountered.
Fraser P. Price, John M. Thornton
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Demonstration of Avrami’s kinetics: Connection with rate equations for clustering on surfaces
Physical Review B, 1996Through an appropriate analogy with the scattering problem a demonstration of Avrami's kinetic theory has been worked out. This approach has been successfully used for obtaining the general solution of the kinetics of the instantaneous growth of multiple phases.
FANFONI, MASSIMO, TOMELLINI, MASSIMO
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2020
Abstract When materials are heated or cooled, their structure often changes. This is called a phase transformation. Phase transformations are used extensively to modify and control the final microstructure and properties of a material during manufacturing into its final product form.
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Abstract When materials are heated or cooled, their structure often changes. This is called a phase transformation. Phase transformations are used extensively to modify and control the final microstructure and properties of a material during manufacturing into its final product form.
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Curing Behavior of an Unsaturated Polyester System Analyzed by Avrami Equation
Thermochimica Acta, 1998The isothermal cure behavior of an unsaturated polyester resin system is studied by differential scanning calorimetry. The reaction heats (at different curing temperatures) are presented and compared to the results of the previous studies. Various kinetic parameters as well as details of the curing process can be obtained and elucidated, based on the ...
S W Kim
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Evaluation of Tripalmitin Crystallization in Sesame Oil Through a Modified Avrami Equation
JAOCS, Journal of the American Oil Chemists' Society, 1998AbstractTripalmitin (TP) crystallization in sesame oil solutions (0.98, 1.80, and 2.62%, wt/vol) was investigated by utilizing a modification of the Avrami equation. The modified equation retains the original correspondence to the nucleation process (i.e., n) and crystal growth and simply corrects the value of the crystallization rate constant (z) by ...
Jorge Fernando Toro-Vázquez
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Some Comments on the ``Avrami'' Equation
Journal of Applied Physics, 1965The ``Avrami'' equation applies rigorously only to a system which does not change volume on transformation and where the developing regions are spheres. The consequences of the impossibility of achieving these conditions in real systems is discussed. It is shown that excessive approximation combined with the use of weight rather than volume fractions ...
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Avrami equation and nonisothermal crystallization of polyethylene investigated by DSC
Thermochimica Acta, 1993The kinetics of the nonisothermal crystallization of polyethylene (alone and crosslinked with a peroxide or filled with silica) has been analyzed assuming a composed crystallization process (primary and secondary) and Avrami coefficients have been determined for each component of the process.
J. Rychly, I. Janigova
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Extensions of the Avrami equation to various polymer crystallization models
Journal of Polymer Science: Polymer Physics Edition, 1979AbstractComputer modelling studies of the progress of crystallization in polymer melts have been carried out initially on those systems analyzed by Avrami and then extended to include a number of complications which may be characteristic of real systems, in particular (a) mixed mechanism, (b) volume shrinkage, (c) variable crystalline density, and (d ...
James N. Hay, Zbigniew J. Przekop
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