ON NONDENDRITIC SOLIDIFICATION FRONT

The commonly accepted types of solidification front should by amplifie d by a new type which represents a nondendritic front formed in the in gots of some alloys under the conditions of commercial production. The nondendritic front follows the eqiaxial-dendritic one. For the both f ronts, a concept of the macrocontinuity and microdiscontinuity of thei r constitution is valid. The microdiscontinuity of solidification fron t causes the possibility of the displacement of solid-phase particles. This calls for the applying of an essential correction to the general theory of solidification-front types. The formation of nondentritic s olidification front is caused by nucleation conditions rather than by the solidification rate and temperature gradient used as the basis for the classification of solidification fronts. The possibility of the c ompatible consideration of these factors in a common concept calls for further investigations.