Simulation study on the texture evolution mechanism of magnesium alloy cylindrical parts with inner ribs during hot power spinning

Abstract

Grasping the mechanism of texture evolution during hot power spinning of magnesium alloy cylindrical parts with inner ribs, which have the dual lightweight advantages of material and structure, can provide a theoretical basis for texture regulation in the preparation of high-performance magnesium alloys. Based on the crystal plastic finite element method, the macro-meso coupled model was constructed and the simulation study of magnesium alloy cylindrical parts with inner ribs during hot power spinning was carried out. The texture evolution mechanism at the position of cylindrical wall (CW) and inner rib (IR) was revealed by tracking the change of grain orientation and the analysis of Schmid factor (SF). The results show that the c-axis of grains of magnesium alloy extruded blank gradually deflects from parallel to tangential direction (TD) to parallel to radial direction (RD). Under the action of radial compressive stress, the formation of texture at CW is attributed to the orientation deflection of grains which have larger SF of basal slip system and locate in the region of the maximum texture strength of blank, while the origin of the texture at IR mainly comes from the orientation deflection of grains with a smaller (0.1~0.2) SF of basal slip system.