Abstract: The present invention provides a high-strength composite modified aluminum alloy part and a preparation method therefor. The preparation method includes: providing an aluminum alloy melt; providing a modifier; adding the modifier to the aluminum alloy melt under an inert gas atmosphere and melting, to obtain a modified aluminum alloy melt; performing casting by using the modified aluminum alloy melt, to obtain the cast aluminum alloy blank; and performing a heat treatment on the modified aluminum alloy blank, wherein the heat treatment includes: a solution treatment, a water quenching treatment, and an aging treatment.

Abstract: The present invention provides a high-plasticity composite modified aluminum alloy product and a preparation method therefor. Wherein, the preparation method includes the following steps: step S1, providing an aluminum alloy melt; step S2, providing a modifier; step S3, adding the modifier to the aluminum alloy melt under an inert gas atmosphere and melting, to obtain a modified aluminum alloy melt; step S4, performing casting by using the modified aluminum alloy melt, to obtain the cast aluminum alloy blank; and step S5, performing a heat treatment on the modified aluminum alloy blank, wherein, the heat treatment includes: a solution treatment, involving heating the aluminum alloy blank to 530° C.-550ºC, and maintaining the temperature for 120-300 min; a water quenching treatment, involving adding the aluminum alloy blank after the solution treatment into a water bath with the temperature of 60° C.-70° ° C.