Deformation and annealing behavior in the 'interaction zone' of cold-rolled tantalum sheets. (June 2019) - Zhu, Jialin
Abstract: The characteristic of the 'interaction zone' in the unidirectional rolled Ta sheets was systematically investigated by X-ray line profile analysis (XLPA), electron backscatter diffraction (EBSD) and transmission electron microscope (TEM). The 'interaction zone' consisted of the {111} (<111>//(normal direction (ND)), {100} (<100>//ND) and {100}-R matrix (rotation grain of {100} matrix rotating by <111> axis of the {100} matrix). The microstructure of the 'interaction zone' with increasing strains was revealed by misorientation map, kernel average misorientation and grain reference orientation deviation-hyper. The occurrence of the 'interaction zone' can be mainly attributed to the large difference of stored energy and the local stress between the {111} and {100} matrix, and the {100}-R matrix seemed to provide strain accommodation between the metastable {111} and stable {100} matrix. Schmid factor analysis indicated that the deformation behavior within the 'interaction zone' showed strong orientation dependence. Therefore, the difference in the stored energy and the fragmentation of microstructure led to a heterogeneous driving force and preferred nucleation sites in the 'interaction zone', resulting in subsequent different recrystallization kinetics when sample annealed at 1050 °C under vacuum condition. Highlights: The characteristic of the 'interaction zone' in the cold-rolled Ta with different strain was investigated systematically. The {100}-R matrix in the 'interaction zone' is the rotation grain of {100} matrix rotating by <111> axis of {100} matrix. Schmid factor analysis was adopted to clarify the deformation behavior of grain in the 'interaction zone'. The gap in stored energy and nucleation sites in the 'interaction zone' leads to the different recrystallization kinetics.