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Al-Ti-B master alloy is currently the most widely used grain refiner in aluminum alloys. Reaction controlling plays an important role in changing alloy microstructure and improving the refining effect. In this paper, Al-Ti-B master alloy is prepared by the fluoride salt method, and the control of the in-situ generated phases is realized by establishing a thermodynamic analysis modelling. Results show that the reactant change caused by the difference of alloy system directly determines the reaction sequence, which in turn affects the type and quantity of phases. The combination of elemental Ti and B is affected by the reaction system. When KBF4 is firstly consumed, TiB2 and TiAl3 are produced. And when K2TiF6 is firstly consumed, only TiB2 and AlB2 are generated in the system. Thermal balance calculation results indicate that aluminothermic reaction has a contribution to the pool temperature, which facilitates to improve the kinetic conditions of the reduction reaction.

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