scholarly journals Effect of the vacancy interaction on antiphase domain growth in a two-dimensional binary alloy

1997 ◽  
Vol 56 (9) ◽  
pp. 5261-5270 ◽  
Author(s):  
Marcel Porta ◽  
Carlos Frontera ◽  
Eduard Vives ◽  
Teresa Castán
Keyword(s):  
Binary Alloy ◽  
Antiphase Domain ◽  
Domain Growth ◽  
Two Dimensional

Effect of interatomic interactions on antiphase domain growth in two-dimensional ternary alloys

1999 ◽  
Vol 121-122 ◽  
pp. 719
Author(s):  
Marcel Porta ◽  
Carlos Frontera ◽  
Eduard Vives ◽  
Teresa Castán
Keyword(s):  
Antiphase Domain ◽  
Ternary Alloys ◽  
Domain Growth ◽  
Two Dimensional

scholarly journals Directional solidification of a binary alloy into a cellular convective flow: localized morphologies

1999 ◽  
Vol 395 ◽  
pp. 253-270 ◽  
Author(s):  
Y.-J. CHEN ◽  
S. H. DAVIS
Keyword(s):  
Directional Solidification ◽  
Binary Alloy ◽  
Temporal Dynamics ◽  
Three Dimensional ◽  
Multiple Scale ◽  
Solute Diffusion ◽  
Two Dimensional ◽  
Morphological Instability ◽  
Flow Strength ◽  
Weakly Nonlinear

A steady, two-dimensional cellular convection modifies the morphological instability of a binary alloy that undergoes directional solidification. When the convection wavelength is far longer than that of the morphological cells, the behaviour of the moving front is described by a slow, spatial–temporal dynamics obtained through a multiple-scale analysis. The resulting system has a parametric-excitation structure in space, with complex parameters characterizing the interactions between flow, solute diffusion, and rejection. The convection in general stabilizes two-dimensional disturbances, but destabilizes three-dimensional disturbances. When the flow is weak, the morphological instability is incommensurate with the flow wavelength, but as the flow gets stronger, the instability becomes quantized and forced to fit into the flow box. At large flow strength the instability is localized, confined in narrow envelopes. In this case the solutions are discrete eigenstates in an unbounded space. Their stability boundaries and asymptotics are obtained by a WKB analysis. The weakly nonlinear interaction is delivered through the Lyapunov–Schmidt method.

Short-range ordering of Cu3Au above Tc in the topmost 80 A of a (001) face

1997 ◽  
Vol 12 (1) ◽  
pp. 75-82 ◽  
Author(s):  
M. Kimura ◽  
J. B. Cohen ◽  
S. Chandavarkar ◽  
K. Liang
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Surface Region ◽  
Antiphase Domain ◽  
Range Order ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Diffuse Intensity ◽  
Near Surface ◽  
Atomic Displacements

The short-range order in the near surface region of the Cu3Au(001) face was investigated above the critical temperature by glancing-incidence x-ray diffraction, measuring the diffuse intensity throughout a two-dimensional region of reciprocal space. This intensity was analyzed quantitatively to obtain the two-dimensional Cowley–Warren short-range-order parameters and atomic displacements. Monte-Carlo simulation based on these values has revealed that the atomic configurations in the surface consist of ordered domains and clusters in a disordered matrix. There is a large number of {10} antiphase domain boundaries (APDB).

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