IN-SITU NANO-REINFORCED ALUMINUM ALLOY HUB FOR NEW ENERGY AUTOMOBILE AND MANUFACTURING METHOD THEREFOR

摘要

A method for manufacturing a lightweight, high-strength, and fatigue-resistant in-situ nano-reinforced aluminum alloy hub for a new energy automobile. The method achieves nano-particle combined reinforcement by means of Orowan strengthening and grain boundary strengthening by employing an in-situ chemical melt reaction and achieves grain boundary strengthening by integrating long-acting combination modification and refinement. The method adopts nitrogen-argon composite rotary air refining and aluminum-rare earth purification technology to achieve multi-stage deep purification of an aluminum melt, forms a protective layer on the surface of the melt by leveraging the fact that the density of argon is higher than that of air, and introduces an aluminum-rare earth intermediate alloy to produce an intermediate compound having a density greater than that of the particles, thereby effectively achieving deep and efficient purification. The method also adopts a novel low-pressure forming technology of sequential solidification and rapid crystallization. Due to the shortening of crystallization time, the secondary dendrite arm spacing in the microstructure of a casting becomes shorter, the microstructure is refined, and the feeding effect is enhanced, such that the casting structure is denser, thus obtaining a hub having high-strength plasticity, high fatigue resistance, and high density. Further disclosed is the lightweight, high-strength, and fatigue resistant in-situ nano-reinforced aluminum alloy hub for a new energy automobile.