The invention relates to an aluminum
titanium carbonitride
alloy grain refiner which contains 1%-10% of
titanium carbonitride and 90%-99% of aluminum. A preparation method comprises the following steps: (1) dosing; (2) preparing an aluminum
titanium carbonitride precast block; (3)
smelting, putting aluminum into a
heating furnace for preheating, heating under the
inert gas protection or under the condition of adding covering agent, fully
smelting aluminum to obtain molten aluminum, and then pressing the aluminum
titanium carbonitride precast block into the molten aluminum at 800-1100 DEG C, after the aluminum
titanium carbonitride precast block is fully smelted, adjusting the temperature of the molten aluminum to 800 DEG C and stirring for 5-30 min while keeping temperature, then adjusting the temperature of the molten aluminum to 700-720 DEG C, adding a refining agent being 0.4%-1.2% of the total
mass into the molten aluminum, stirring and refining for 5-20 min, standing by and keeping temperature for 5-10 min, thereby obtaining an aluminum
titanium carbonitride intermediate
alloy solution; (4) pouring. The aluminum titanium carbonitride
alloy grain refiner provided by the invention has excellent grain refining capacity and can further promote the comprehensive
mechanical property of aluminum and aluminum alloy.