DISLOCATION MODEL OF SOLIDIFICATION AND THE FORMATION OF AMORPHOUS SOLIDS

Abstract

The solidification and the formation of amorphous solids are discussed on the basis of a dislocation model of liquids, which was recently developed by the present author. We suppose that the solidification takes place when dislocation networks in a liquid are swept out of it. Then the rate of crystal growth and its anisotropy are calculated in terms of the mobility of dislocation networks. An amorphous solid is obtained when a liquid is cooled to a temperature, at which dislocation networks cannot move, before the dislocation networks are swept out of it. The Peierls-Nabarro stress and the interaction with solute atoms resist the motion of dislocations, and conduce the formation of amorphous solids.