DIFFERENT GROWTH REGIMES DURING DIRECTIONAL DENDRITIC GROWTH

In a recent paper using a numerical treatment of array dendritic growt h Hunt and Lu [I] predicted that two growth regimes exist during the a rray growth of dendrites. The present paper describes experimental wor k which clearly shows that the two regimes exist and that the model pr edicts the transition with remarkable accuracy. The work also showed e xperimentally that the form of non-dimensionalisation successfully des cribes cellular and dendritic growth. The importance of the transition to conventional casting processes is discussed. (C) 1997 Acta Metallu rgica Inc.