Kinetic properties of a dendrite tip in a supercooled melt of pure metal.

High-speed dendritic growth of a crystal from a deeply supercooled pure metal melt is considered. The dendrite tip growth equation serves as the basis of the study, while local nonequilibrium heat transfer prop- erties have also been taken into account. The regularities of melt supercooling influence on the curvature of the apex behaviour and heat removal from the solid phase have been obtained. The interval limits of crystal- lization phase boundary aperiodic stability are calculated. A standing wave of perturbation of the dendrite tip has been studied: the periods of oscillations in coordinate and time have been determined, as well as the pat- terns of their behavior when the wave attenuation parameter changes have been indicated. The results of a comparative analysis of the dendrite tip kinetic properties for nickel and copper are presented