About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Molecular Dynamics Simulations of Heterogeneous Nucleation from Undercooled Melt |
Author(s) |
Fujinaga Takuya, Yasushi Shibuta |
On-Site Speaker (Planned) |
Fujinaga Takuya |
Abstract Scope |
Heterogeneous nucleation from undercooled melt is systematically investigated by molecular dynamics simulations. Firstly, athermal heterogeneous nucleation via grain refiners inoculated in undercooled Al melt is investigated. A thin solid Al layer appears on close-packed surfaces of a cubic Ti particle and it grows to a spherical cap consisting of FCC Al, whereas no cap structure appears on the other surfaces. There is a threshold undercooling temperature dividing growth modes between stagnation and free growth. Since threshold undercooling temperature is proportional to the inverse of effective particle radius, cap formation at the surface of the Ti particle is regarded as athermal heterogeneous nucleation. Next, the effect of anisotropy seed crystal on morphology of crystal is investigated for several FCC metals. Preferential growth toward specific orientation causes asymmetric crystal structure. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |