Engulfment and pushing of inclusions at solidifying front of organic materials

Abstract

Engulfment behavior was observed in situ using transparent organic materials and the critical growth velocities were determined. The critical growth velocity of the SCN-acetone alloys increased with increasing temperature gradient and decreasing alloy concentration, while that of the salol-acetone alloys was independent of temperature gradient. Not only the interfacial energies but also the interface shape and morphology contribute to the engulfment/pushing behavior. The present result suggests that conventional alloys show the engulfment behavior of inclusions/insoluble particles as well as the organic alloys. © 1996 ISIJ.