Abstract
Al–5Ti–0.8C and Al–5Ti–1.2C master alloys have been successfully prepared by reaction of K 2TiF 6 salt and graphite powder with molten Al. While the Al–5Ti–0.8C consists of some TiAl 3 particles in addition to TiC particles in the Al matrix, the Al–5Ti–1.2C master alloy revealed the presence of only TiC particles. The grain refining efficiency of these two master alloys has been compared with that of the conventional Al–5Ti–1B master alloy on Al and Al–7Si alloy at different addition levels. Al–5Ti–1.2C master alloy was found to be the most efficient grain refiner for Al amongst the grain refiners studied. Even in case of Al–7Si alloy, the Al–5Ti–0.8C and Al–5Ti–1.2C master alloys performed better than conventional Al–5Ti–1B master alloy. However, the Al–5Ti–1.2C master alloy shows poor response to grain refinement in Al–7Si alloy at higher addition levels than the Al–5Ti–0.8C master alloy, indicating poisoning.
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