Dynamics of a faceted nematic–smectic-Bfront in thin-sample directional solidification

Directional solidification of a faceted crystal. II. Phase dynamics of crenellated front patterns

Dynamics of low anisotropy morphologies in directional solidification.

We report experimental results on quasi-two-dimensional diffusion limited growth in directionally solidified succinonitrile with small amounts of poly(ethylene oxide), acetone, or camphor as a solute. Seaweed growth, or dense branching morphology, is selected by growing grains close to the [111] plane, where the in-plane surface tension is nearly isotropic. The observed growth morphologies are ...

Nonequilibrium molecular dynamics simulation of rapid directional solidification

We present the results of non-equilibrium molecular dynamics simulations for the growth of a solid binary alloy from its liquid phase. The regime of high pulling velocities, V , for which there is a progressive transition from solute segregation to solute trapping, is considered. In the segregation regime, we recover the exponential form of the concentration profile within the liquid phase. Sol...

Cellular instabilities in directional solidification

2014 We have studied the morphology of the solid-liquid interface during the directional solidification of thin (5-150 03BCm) samples of a dilute binary mixture (CBr4/~ 0.1 % Br2) . Above a critical pulling speed, for a given temperature gradient and solute concentration, the interface, initially planar, breaks down into a periodic cellular pattern. The bifurcation from a planar to a cellular s...

Dynamics of the solidification of laser-annealed Si thin films

Nanosccond time-resolved reflectivity and transmis~ion measurements are uscd for the observation of solidification phenomena, following incornpletc or complete rneltrng of thin Si films ( d = 125 nm) by nanosecond laser pulses. Solidification is observed to proceed at the liquid-solid interface as Tong as the film is not melted completely. OR complete melting of the film, nucleation in the liqu...