Macrosegregation during growth of a dendrite array into a stirred melt at near steady-state conditions

Abstract

Solidification experiments on tin alloys have been carried out where the interface morphology consisted of an array of dendrites advancing at near steady-state conditions. It was found that a fairly severe degree of mixing changed the dendrite morphology at low temperature gradients but not at higher gradients. In both cases the mixing was relatively ineffective at producing a macrosegregation in the presence of the dendrite array. The results may be interpreted as evidence that in some cases one would expect very little macrosegregation in columnar growth under near steady-state conditions even in the presence of severe liquid convection.