Local collective dynamics at equilibrium BCC crystal-melt interfaces
Abstract
We present a classical molecular-dynamics study of the collective dynamical properties of the coexisting liquid phase at equilibrium body-centered cubic (BCC) Fe crystal-melt interfaces. For the three interfacial orientations (100), (110), and (111), the collective dynamics are characterized through the calculation of the intermediate scattering functions, dynamical structure factors and density relaxation times in a sequential local region of interest. An anisotropic speed up of the collective dynamics in all three BCC crystal-melt interfacial orientations is observed. This trend differs significantly different from the previously observed slowing down of the local collective dynamics at the liquid-vapor interface [Acta Mater 2020;198:281]. Examining the interfacial density relaxation times, we revisit the validity of the recently developed time-dependent Ginzburg-Landau (TDGL) theory for the solidification crystal-melt interface kinetic coefficients, resulting in excellent agreement with both the magnitude and the kinetic anisotropy of the CMI kinetic coefficients measured from the non-equilibrium MD simulations
Cite
@article{arxiv.2207.14456,
title = {Local collective dynamics at equilibrium BCC crystal-melt interfaces},
author = {Xin Zhang and Wenliang Lu and Zun Liang and Yashen Wang and Songtai Lv and Hongtao Liang and Brian B. Laird and Yang Yang},
journal= {arXiv preprint arXiv:2207.14456},
year = {2022}
}
Comments
10pages, 6 figures