Speaker
Description
Out-of-equilibrium phase transformation is the main phenomenon controlling the chemical partitioning of elements at micro-scale during additive manufacturing, impacting as a result the isotropy of microstructures. Currently, the behavior of out-of-equilibrium interfaces is not well understood, although it is mandatory for investigating the formation of microstructures. This lack of understanding is due to the difficulty to design and perform controlled experiments at the scale of the interface.
The Cu-Ni system has been chosen as a study case for a solid-liquid interface simulation using molecular dynamics. The Cu-Ni EAM potential used in this study is described in [1], with a simulation box of roughly 400,000 atomes at 1400K for a duration up to 100ns.
The diffusion controlled motion of the interface is studied during the solutal melting of the two pure elements using LAMMPS, where the composition profiles evolutions are extracted along with interface velocity and diffusion coefficients. The later results serve as feeding parameters for a diffusion model in order to compare the obtained results to the available literature experimental data.
[1] B. Onat, and S. Durukanoğlu (2013), "An optimized interatomic potential for Cu–Ni alloys with the embedded-atom method", Journal of Physics: Condensed Matter, 26(3), 035404.
| Speaker Country | France |
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