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- W2024694519 abstract "We present results of computer simulations of the time evolution of a model binary alloy following quenching. Our model system is a simple cubic lattice each site of which is occupied by either an $A$ or a $B$ atom. There is a nearest-neighbor interaction which favors segregation into an $A$-rich and a $B$-rich phase at a point inside the two-phase region. Starting from a random configuration the system is quenched to and evolves at a finite temperature $T$ as exchanges between atoms on nearest-neighbor sites are allowed to take place. In our present study, a lattice having a 20% concentration of $A$ atoms (${overline{n}}_{A}=0.20$), was quenched to temperatures $T=0.6{T}_{c}$ and $T=0.9{T}_{c}$, inside the two-phase region, and to $T=1.1{T}_{c}$. We study the evolution of the spherically averaged structure function $S(k,t)$, the energy, and various cluster properties, and compare our results with relevant theoretical predictions. We also compare the late time cluster distributions of small clusters for $T=0.6{T}_{c}$ and $T=0.9{T}_{c}$ with the equilibrium cluster distributions for corresponding temperatures on the coexistence curve (namely, ${overline{n}}_{A}=0.0146$ at $T=0.6{T}_{c}$, and ${overline{n}}_{A}=0.1272$ at $T=0.9{T}_{c}$). This shows that the phase segregation at $T=0.6{T}_{c}$ takes place in two distinct stages (i) a rapid condensation of the $A$ atoms into liquid drops and a gas phase consisting of monomers, dimers, etc., and (ii) a slow growth of the droplets. At $T=0.9{T}_{c}$ (which is well inside the classical metastable region) such a segregation still seems to take place but at a slower rate." @default.
- W2024694519 created "2016-06-24" @default.
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- W2024694519 date "1977-03-15" @default.
- W2024694519 modified "2023-10-09" @default.
- W2024694519 title "Time evolution of a quenched binary alloy. IV. Computer simulation of a three-dimensional model system" @default.
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- W2024694519 doi "https://doi.org/10.1103/physrevb.15.3014" @default.
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