ANALYSIS OF THE RIBBON FORMATION PROCESS ON THE SINGLE ROLLER RAPID SOLIDIFICATION TECHNIQUE.

Abstract

The effect of cooling conditions on the structure of the momentum boundary layer has been studied. In spite of some recent results, the computations, which take the heat and momentum transport and the temperature dependence of viscosity into account, suggest a more effective momentum transport and a thicker ribbon for better cooling conditions, supporting former expectations based on pure heat transport treatment. It is also indicated that solidification-controlled ribbon formation can be excluded. Since the most extended studies of the boundary layer structure have been published for the glass forming alloy, Fe//4//0Ni//4//0P//1//4B//6, physical properties characteristic of this composition are used.