Abstract
In the present work, ternary Al–Ti–B master alloys have been prepared in an induction furnace by the reaction between preheated halide salts (K2TiF6 and KBF4) and liquid molten Al. A number of process parameters such as reaction temperature (800, 900, 1,000 °C), reaction time (45, 60, 75 min.) and compositions (Ti/B ratio: 5/1, 1/3) have been studied. The indigenously prepared master alloys were characterised by chemical analysis, particles size analysis, XRD and SEM/EDX microanalysis. Results of particle size analysis suggest that the sizes of the intermetallic particles [Al3Ti and TiB2 in Al–5Ti–1B and (Al, Ti)B2 in Al–1Ti–3B] present in various Al–Ti–B master alloys increases with increase in reaction temperature (800–1,000 °C) and reaction time (45–75 min.). The population of the particles decreases with increase in reaction time and temperature. Further, SEM/EDX studies revealed that different morphologies of the intermetallic particles were observed at different reaction temperatures and reaction times. Further, the performances of the above-prepared master alloys were assessed for their grain refining efficiency on Al–7Si alloy by macroscopy, DAS analysis. Grain refinement studies suggest that, B-rich Al–1Ti–3B master alloy shows better grain refinement performance on Al–7Si alloy when compared to Ti-rich Al–5Ti–1B master alloy.
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