Kinetics of quenched systems with long-range repulsive interactions

1990 ◽  
Vol 42 (10) ◽  
pp. 6658-6669 ◽  
Author(s):  
Christopher Roland ◽  
Rashmi C. Desai
Keyword(s):  
Long Range ◽  
Repulsive Interactions ◽  
Quenched Systems ◽  
Kinetics Of

On the Mechanism of Milling Induced Disordering in AlFe

1996 ◽  
Vol 460 ◽  
Author(s):  
M. T. Clavaguera-Mora ◽  
J. Zhu ◽  
M. Meyer ◽  
L. Mendoza-Zelis ◽  
F. H. Sanchez ◽  
...  
Keyword(s):  
Long Range ◽  
Milling Time ◽  
Continuous Heating ◽  
X Ray Diffraction ◽  
Mechanical Grinding ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Diffusion Controlled ◽  
Transmission Mössbauer Spectroscopy ◽  
Kinetics Of

ABSTRACTThe evolution of the B2-AlFe phase during mechanical grinding in Ar has been examined as a function of milling time by X-Ray diffraction, transmission Mössbauer spectroscopy and differential scanning calorimetry. Short and long range disorder was observed to increase with the mechanical treatment up to the attainment of a steady state. The evolution of the long range order parameter and of the local atomic configurations at Fe sites were analyzed in terms of possible mechanisms for milling induced disordering. The kinetics of the thermal reordering was studied under continuous heating and isothermal calorimetrie regimes. Modeling of the reordering processes by diffusion controlled growth of pre-existing ordered grains is presented as well as the estimated values of both the enthalpy and the activation energy of the reordering process. The results are consistent with a non uniform distribution of disorder throughout the sample and will be compared with preceding information on related systems.

Role of Long-Range Repulsive Interactions in Two-Dimensional Colloidal Aggregation:  Experiments and Simulations

Langmuir ◽  
2002 ◽  
Vol 18 (24) ◽  
pp. 9183-9191 ◽  
Author(s):  
A. Moncho-Jordá ◽  
F. Martínez-López ◽  
A. E. González ◽  
R. Hidalgo-Álvarez
Keyword(s):  
Long Range ◽  
Two Dimensional ◽  
Colloidal Aggregation ◽  
Repulsive Interactions

Kinetics of short- and long-range B2 ordering in the pair approximation

1990 ◽  
Vol 5 (7) ◽  
pp. 1419-1430 ◽  
Author(s):  
B. Fultz
Keyword(s):  
Long Range ◽  
Activation Barrier ◽  
Binary Alloys ◽  
Interatomic Interaction ◽  
Pair Approximation ◽  
Rate Equations ◽  
Barrier Heights ◽  
Numerical Integrations ◽  
Kinetics Of ◽  
Overall Kinetics

The kinetic master equation is developed in the pair approximation to study disorder ⇉ B2 order transformations in bee binary alloys. Coupled sets of rate equations for the pair variables are obtained for atom movements by either the direct interchange mechanism or the vacancy mechanism. Numerical integrations provide the nonequilibrium relaxations of short- and long-range order (SRO and LRO) and the vacancy balances between the two sublattices. For binary alloys, disorder ⇉ order transformations were studied for all combinations of interatomic interaction strengths, activation barrier heights, and alloy stoichiometry variations. After a transient vacancy relaxation, all cases began with a quick relaxation of SRO, followed later and independently by the growth of LRO and additional SRO. There were some variations in kinetic path through SRO and LRO, moderate variations in overall kinetics, and large variations in vacancy balance. Some nonphysical aspects of kinetics in the pair approximation are discussed.

Sign in / Sign up

Export Citation Format

Share Document