Abstract:Due to the excellent high-temperature and lightweight properties of γ-TiAl alloys, they have great application potential in the aerospace field. However, the inherent brittleness of γ-TiAl alloys poses significant challenges to precision machining. Water lubrication can reduce the processing temperature, which can help solve the problems of friction, heat accumulation, and tool wear faced by γ-TiAl alloys during processing, as well as reduce crack initiation and overcome the inherent brittleness of γ-TiAl alloys. This makes water lubrication a very promising method in the processing of γ-TiAl alloys. Therefore, a molecular dynamics (MD) simulation was used to construct a nano-scratching model of single-crystal γ-TiAl alloy under water lubrication, and the effect of scratching speed on the scratching force, substrate temperature, plastic deformation, and surface quality of single-crystal γ-TiAl alloy during nano-scratching was systematically studied under water lubrication. As the scratching speed increased, both the scratching force and temperature increased significantly. However, under water layer lubrication, when the water layer thickness was 1nm, the substrate temperature fluctuation was small, showing a good cooling effect. When the scratching speed reached 400m/s, the plastic deformation of the workpiece surface was significantly aggravated, the accumulation of chips increased, and the surface roughness decreased.