Method for regulating and controlling solidification structure of aluminum-silicon-iron alloy through gas phase synergistic double-melt blending

The invention discloses a gas phase synergistic double-melt blended aluminum-silicon-iron alloy solidification structure regulation and control method, which comprises the following steps of: introducing CH4 gas into high-temperature aluminum-titanium alloy liquid, decomposing C-containing active particles from the CH4 gas in the alloy melt, carrying out gas-liquid reaction on the C-containing active particles and Al and Ti particles to generate intermediate phases such as Al4C3, Ti3AlC and the like and unstable TiC particles, and reacting the intermediate phases to generate TiC nano particles with thermodynamic stability; meanwhile, an aluminum-silicon alloy melt and an aluminum-iron alloy melt which have significant differences in volume and temperature are blended in a controlled diffusion mode to obtain an aluminum-silicon-iron melt, and in the gas-liquid blending process, due to the fact that the solid/liquid interface propelling direction is opposite to the solute diffusion direction when the melt is so