Abstract
Al-Ti-B master alloys have received much attention in recent years owing to their potential as efficient grain refiners for aluminum foundry alloys. A process involving in-situ reduction of K2TiF6 and B2O3 with excess aluminum in the presence of cryolite flux has been developed for the preparation of Al-Ti-B master alloys using a melt reaction method by microwave irradiation. The microstructure and synthetic process of the master alloy were investigated by optical microscopy and X-ray diffraction. The results show that the master alloy is composed of Al, Al3Ti and TiB2 phases and microwave irradiation method can be used to fabricate Al-Ti-B master alloy in situ from the K2TiF6-2O3-Na3AlF6 and Al system when the aluminum melted. The synthesis mechanisms of the master alloy are as follows: Al3Ti is formed through the reaction between K2TiF6 and Al melt at 850 °C.
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