Surface Characteristics and Crystallographic Texture Evolution of Aviation Aluminum Alloy in High-Speed Machining Based on Visco-Plastic Self-Consistent Model

The purpose is to investigate the surface characteristics and crystallographic texture evolution of aviation aluminum alloy during high-speed machining (HSM). The influence mechanism of machining parameters on the surface quality of Al 7050 is explored through HSM experiments, and the distribution of cutting temperature, equivalent stress and strain, and the variation trend of variables in the deformation zone on the path is analyzed by finite element (FE) simulation. Combining FE simulation and polycrystalline plasticity theory, a visco-plastic self-consistent (VPSC) model is established to simulate the crystal texture evolution in the machined surface layer, and the validity of the constructed model is confirmed by dynamic impact and EBSD results. The results show that the high-speed machined surface displays tool feed marks, apophysis, cavities, side flow bands and adhered chip debris. The overall trend of temperature and equivalent stress on the path shows a “spoon-like” distribution and an “M-like” distribution, respectively. The cutting temperature, equivalent stress and strain increase in relation to three cutting factors, where the cutting temperature and equivalent stress increase by 3% and 2.9%, respectively. VPSC simulations show the textures of {001}<100>Cube, {123}<634>S, {110}<112>Brass, and {112}<110>R-Copper which are present on the machined surfaces, and high feed rate and cutting speed enhance and weaken the strength of the {123}<634>S and {001}<100>Cube textures. The difference in texture maximum density under different machining parameters is 34%, and the type and intensity of crystal texture are profoundly influenced by the coupling effect of heating/force load, stress, and strain.