▎ 摘　　要

NOVELTY - Method for improving strong toughness of laser melting deposition aluminum alloy forming piece, comprises (a) putting graphene oxide into ethanol solution, and uniformly stirring to obtain graphene oxide ethanol solution, (b) mixing the graphene oxide ethanol solution with the aluminum alloy powder, and uniformly stirring to obtain composite powder slurry, (c) heating and drying the composite powder slurry in the vacuum environment to obtain the dried composite powder, and (d) grinding, polishing and cleaning the aluminium alloy substrate, and using the laser cladding device to clad the dried composite powder on the aluminum alloy substrate to obtain an aluminum alloy forming piece. USE - Method for improving strong toughness of laser melting deposition aluminum alloy forming piece for aerospace, ship, automobile and rail transportation. ADVANTAGE - The method uses the surface activity of graphene oxide, wettability and thermal reduction principle, and the beneficial effects are: graphene oxide having high dispersibility in the ethanol; the surface of the aluminum alloy having high wettability, and can prepare the uniformly dispersed composite powder; and graphene oxide that improves the absorptivity of the aluminium alloy to the laser, and is reduced to graphene under the action of laser high energy, and then matched with the laser melting deposition technology to enhance the toughening effect. The method solves the problem of how to improve the interface bonding performance of graphene and aluminum alloy and uniformly disperse the graphene in the aluminum-alloy substrate under the premise of ensuring the spherical degree of aluminum alloy powder.