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Development of Al-Ti-C grain refiners containing TiC

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Abstract

Cast Al-Ti-C grain refiners were synthesized by reacting up to 2 pct graphite particles of 20 micron average size with stirred Al-(5 to 10) pct Ti alloy melts, which generated submicron-sized TiC particles within the melts, and their solidified structures showed preferential segregation of the carbide phase in the grain or cell boundary regions and occasional presence of free carbon whose amount exceeded equilibrium values. At the usual melt temperatures of below 1273 K, though, TiC formed first, but was subsequently found to react with the melt forming a sheathing of A14C3 and Ti3AlC which resulted into poisoning of the TiC particles. However, it was possible to reverse these reactions in order to regain the virgin TiC particles by superheating the melts in the temperature region where TiC particles are thermodynamically stable. Grain refining tests using the TiC master alloys produced fine equiaxed grains of cast aluminum whose sizes were comparable to that obtainable with the standard TiB2 commercial grain refiner. TiC particles introducedvia the master alloys were found to occur in the grain centers, thereby confirming that they nucleated aluminum crystals.

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Authors and Affiliations

  1. Institut für Metallforschung-Metallkunde, Technische Universität Berlin, Strasse des 17 Juni 135, D-1000, Berlin 12

    Abinash Banerji (Scientist) & Winfried Reif (Professor)

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  1. Abinash Banerji
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  2. Winfried Reif
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On leave from Regional Research Laboratory (CSIR), Bhopal, is Research Associate.

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Banerji, A., Reif, W. Development of Al-Ti-C grain refiners containing TiC. Metall Trans A 17, 2127–2137 (1986). https://doi.org/10.1007/BF02645911

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