Abstract
The authors have found that in the melt growth of aluminum bicrystals under certain conditions, the crystal boundary rotates about the direction of heat flow during progressive solidification, even though the crystal boundary area increases. This crystal boundary phenomenon may not be analogous to that found by Chalmers in tin and lead. It is suggested that the former occurs in the bicrystals the boundaries of which have twist components, and in which a cellular substructure grows appreciably so that there will be a variation in the thermal conductivity for different directions. In the high purity aluminum bicrystals this boundary phenomenon does not occur.
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