부산대학교 도서관

The effect of high-frequency rotational vibrations with small amplitude on the oriented crystallization of binary alloys has been numerically studied. The calculations have been made in the framework of the quasi-static approach for succinonitrile-acetone and succinonitrile-salol binary systems. It has been shown that at a large solidification rate and/or high impurity concentration both for a lighter impurity (acetone) and for a heavier one (salol) a pit is formed on the axis of symmetry during growth which accelerates the development of morphological instability. Rotational vibrations make a strong stabilizing effect. The threshold for morphological instability increases with an increase in the vibration intensity, the radial segregation of an impurity decreases, and the pit is not formed.