After repeated rolling, the average

After repeated rolling, the average size of α grains is less than 1μm, nano-scale equiaxed α phase is dispersed and distributed, and there are a small amount of chain and filament α phases along the rolling direction. After two steps of multiple deformations, the cumulative true strain of the sample reached 3.6. During the deformation process, a large number of dislocations in the grains accumulate. Under the action of external force, the hyperplastic dislocation moves along the sliding surface, forming a plug product when it encounters the boundary and the second obstacle. The accumulation of dislocations in the grains leads to the formation of cell and sub-crystalline structures, which in turn form sub-grain boundaries at small angles. With the rapid increase in the amount of deformation and deformation, a large number of dislocations continue to flow in, forming a stress concentration at the dislocation plug, and eventually forming cracks to fracture the crystal grains. After bidirectional rolling + unidirectional rolling, it can be seen from the scanning electron micrograph of the sample that the β phase is broken and refined to the nanometer level, showing a dispersed distribution, and the larger submicron β phase is distributed along the rolling direction Directionality.