Abstract
Powder of carbides such as TiC, TiC-WC, TaC-WC, and WC was added to pure (99.99%) aluminum. The mixture of Ti-salts (K2TiF6+Na2TiF6) or chiolite was also added as a flux to prevent the oxidation of carbide and molten metal. The molten metal containing the carbide was held at above melting point for a period. After slow solidification in a crucible, the grain size of the specimen was determined.The results were summarized as follows:(1) TiC, TiC-WC, and TaC-WC were very effective for the grain refining of pure aluminum. The effects of refining of these carbides were almost kept constant and the size of grains was not coarser after the molten metal was held at such a high temperature.(2) WC had less effects on the refining as compared with other carbides, and it was difficult to get a homogeneous specimen by mixing WC into aluminum.(3) Chiolite was a very favorable salt for promoting the production of homogeneous specimens consisting of aluminum and carbide.(4) The addition of hexachlorethane showed no change in the grain size of aluminum containing titanium.
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