Study on Hot Deformation Behavior and Texture Evolution of Aluminum Alloy 7075 Based on Visco-Plastic Self-Consistent Model

Abstract

In this paper, the VPSC (visco-plastic self-consistent) model was improved by considering the effect of heating rate. The hot compression deformation behavior and texture evolution of AA7075 were studied based on the improved VPSC model and EBSD (electron back-scattering diffraction). The stress–strain curves, inverse pole figure (IPF), and orientation distribution function (ODF) of the material were analyzed by combining TSL-OIM-Analysis, MTEX, and other analysis software. By observing the changes in grain structure and micro-texture of the material before and after hot compression deformation, the influence of macro-deformation conditions on the microstructure evolution of the material was studied, and the evolution law of grain structure and micro-texture was analyzed. It was found that the hot deformation parameters have significant effects on the stress–strain curve characteristics and micro-texture evolution of AA7075 during hot deformation. Copper {112} <111> and {011} <11¯1> are the main textures, and the strength and distribution of typical textures such as Copper {112} <111>, Cube {001} <100>, and Goss {011} <100> show regularity with the change in deformation conditions. Through comparing the predicted results of the improved VPSC model and experimental data, it is distinct that the improved VPSC model is suitable to predict the micro-texture evolution of AA7075 during hot compression. Finally, the sensitivity of micro-texture evolution to hot compression parameters such as heating rate was analyzed.