Study of Interdentritic Feeding and Hot Bearing on the Example of Aluminum Silicon Alloys.

The purpose of this paper is to describe all partial processes from beginning to end of solidification which play an important part in the possible occurrence of a hot tear in the cold casting. Different types of solidification stresses may be the cause of hot tearing unless the alloy has good hot tearing resistance and/or a good healing (or interdendritic feeding) capacity. Healing capacity is determined by the temperature-dependent solid fraction and crystal morphology. Experimental determinations of interdendritic feeding capacity of Al-Si alloys with 1 to 7. 5% Si and the effects of grain refining and application of external pressure are reported. 50 refs.