Simulation of Solidification Structures of Binary Alloys: a Multi-Particle Diffusion Limited Aggregation Model with Surface Rearrangement.

The thermodynamics and kinetics of isothermal solidification in binary alloy melts were simulated in a two-dimensional model incorporating the effects of nearest and next nearest neighbours at the solid-liquid interfaces, taking into account the simultaneous diffusion in the melt of all diffusing paritcles (atoms) and allowing solid-liquid interface rearrangement on a local scale. The next nearest neighbour interaction and the surface rearrangement were shown to have large effects on the resulting morphologies. Further the influences of the operating diffusion coefficient and the sticking rule for the solidifying particle were analysed. A wide range of growth modes, dendritic, massive, equiaxed, eutetic, and transitions there of during solidification, also involving change of time dependency of the growth velocity, as observed in practice, could be given a rationalistic basis.

HAEMERS Tycho Aloui S Marie;  RICKERBY David George;  MITTEMEIJER E.J.; 

1998-10-01

JRC17684

https://publications.jrc.ec.europa.eu/repository/handle/JRC17684,