Abstract
In the macro structure of pure aluminium which were solidified upwards, the columnar structure appeared in the lower part of specimens and granular one was formed on it. The granular crystals seemed to settle from the surface of melt. (the 2nd report) To confirm the settling of the grains the following experiments were performed:(1) To prevent the formation of nucleus the top of melt was heated.(2) To accelerate the formation of nucleus the top was sprayed.(3) The melt was cooled in a cylinder inclined 45°.(4) The melt was cooled in a cylinder having a obstacle plate in it.(5) Chemical analysis of Ti was carried out.According to the results of these examinations, it was confirmed that the granular crystals in the upwards solidified specimens were just these grains which had settled from the surface of melt.
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