A Numerical Model Study of the Effect of Interface Shape on Particle Pushing

AGALIOTIS, E. M.; SCHVEZOV, C. E.; MARIO ROBERTO ROSENBERGER; ARES, A.E.

JOURNAL OF CRYSTAL GROWTH

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2012 vol. 354 p. 49 - 56

0022-0248

Abstract: A numerical model using an axi-symmetric approximation is developed to study particlepushing during solidification. The model is applied to determine the effect of different parameters onthe predicted critical velocity for engulfing of the particle by the solidifying interface. The mainparameters considered are particle radius, interface velocity and interface shape as obtained fordifferent thermal conductivities between matrix and particle. The results show that in the range ofvalues of parameters employed in the calculations, the critical velocity for pushing expand in a range ofone order of magnitude higher and lower for concave and convex interface shapes respectively, whencompared to the critical velocity for a flat interface. Moreover, the predicted critical velocities cover thespan of measured values in agreement with the tendency given by the thermal conductivities andparticle radius.