Modeling of dendritic crystal growth in undercooled Ni-Zr melts

Abstract

Growth of dendritic crystals in undercooled Ni-Zr samples is studied by experimental, analytical and numerical methods. Experimental results provided by electo-magnetic levitation technique are compared with predictions of a sharp-interface model and of a diffuse-interface model. Using the sharp-interface model, kinetics of dendritic growth has been evaluated in the whole range of measured undercooling and of growth velocity of Ni-Zr dendrites. For the undercoolings up to 100 K the results of 2D isothermal and non-isothermal phase-field simulations are compared with the corresponding sharp-interface predictions. A form of modeled dendrites is compared with parabolic dendritic tip analytically found in the sharp-interface model. <p>This work was performed with support from DFG under the projects Nos. He 1601/13 and Ne 822/2</p>