Microstructure and texture heterogeneity of a hot-rolled near-α titanium alloy sheet

In order to realize microstructure and property control during thermo-mechanical processing of titanium alloys, the microstructure and texture of a hot-rolled near-α titanium alloy sheet were investigated. Results show that the sheet exhibits strong microstructure and texture heterogeneity. Supposing the Bunge Euler angle (0°, 0°, 0°) orientation has 112¯0 directions parallel to the rolling direction and the basal plane is parallel to the rolling plane: a) macrozones showing grain orientation of (0°, 90°, 30°) are observed along the rolling direction in regions with few β phase particles; b) the recovery or recrystallization degree of grains with crystal orientations of (0°, 90°, 30°), (30°, 90°, 30°) and (70°, 90°, 0-30°) in turn increased, showing the dependence of the recovery or recrystallization degree on grain orientation; and c) dislocation substructure in grains with different recrystallization degrees exhibits various patterns, including dislocation tangles, polygonization, arrays, nets, and subgrain boundaries.