Influence of solidification rate on solid-liquid interface of Si-Ta alloy

The influence of solidification rate on the solid-liquid interface of Si-Ta alloy was studied by the zero power method. The results show that the solid-liquid interface morphology has the following evolution processing: planar interface→shallow cell interface→cell interface→shallow cell interface→planar interface when the solidification rate varies from 0.3 mm/min to 9.0 mm/min. At the lower solidification rates, the experiment results can be consistent with Jackson-Hunt theory well. However, there is a deviation between the theory calculation and the experiment at the higher solidification rates. This is caused by the change of the thermodynamics and kinetics, and the solid-liquid interface can get to planar interface at the solidification rate V=5.0 mm/min.