High apparent creep activation energies in mushy zone microstructures

Study of Mushy-Zone Development in Dendritic Microstructures with Glass-Forming Eutectic Matrices Using Electrostatic Levitation

Importance of Melt Flow in Solidifying Mushy Zone

A mixture solidification model is employed to study the interaction between the melt flow and the growing mushy zone. The goal is to address the importance of considering the melt flow and flow pattern (laminar or turbulent) in the growing mushy zone. A simple 2D benchmark with parallel flow passing by/through a vertically growing mushy zone is considered. Parameter studies with different veloc...

The rapid advance and slow retreat of a mushy zone

We discuss a model for the evolution of a mushy zone which forms during the solidification of a binary alloy cooled from below in a tank with finite height. Our focus is on behaviours of the system that do not appear when either a semi-infinite domain or negligible solute diffusion is assumed. The problem is simplified through an assumption of negligible latent heat, and we develop a numerical ...

Mobility reduction and apparent activation energies produced by hopping transport in the presence of Coulombic defects

A Monte Carlo simulation is proposed to study the mobility reduction due to coulombic defects for hopping transport in a one-dimensional regular lattice. Hops between energetically equivalent sites and within an exponential distribution of energy levels are considered. In absence of coulombic wells, the calculations reproduce the wellknown features of gaussian and highly dispersive transport re...

Measuring relative grain-boundary energies in block-copolymer microstructures.

The (relative) energies of symmetric tilt grain boundaries in a strongly segregated lamellar block copolymer are determined by analysis of the dihedral angles at grain-boundary triple junctions. The analysis reveals two regimes: at low and intermediate misorientations (corresponding to a tilt-angle range 0≤θ≤85°) the grain-boundary energy is found to depend on the tilt angle as E(θ)∼θ(x), with ...