Model pękania krzepnącego stopu

Abstract

In general there are at least two zones in the wall cross section of solidifying metal: an external solid layer and an internal zone that contains crystals and liquid phase (mushy zone). Crystal boundaries being in contact with liquid forms a nuclei of cracks. Development of crack consists in separation of crystals along their boundaries. Presence of liquid phase makes energy needed to develop of nuclei lower and process of increasing of crack dimensions quicker. So, brittleness of metal is caused by presence of liquid. Manifestation of brittleness can be described by violent reduction of deformation time to failure. At temperature at which presence of liquid ends in solidifying metal plastic temperature range starts.