fig5

Figure 5. Radial microstructure evolutions of FET66 and RFET66: (A1-A2), (B1-B2) and (C1-C2) are respectively the central, middle and edge EBSD maps of FET66 rod; (D1-D2), (E1-E2) and (F1-F2) are respectively the central, middle and edge EBSD maps of RFET66 rod. GB: Grain boundary; TB: twin boundary; IPF: inverse pole figure; FRC: free-rotational compression; FET: free end torsion; RD: rolling direction; ED: extrusion direction; RFET: reverse FET; DA: deviation angle; TTB: tensile twin boundary; CTB: compressive twin boundary; STB: secondary twin boundary; DTB: double twin boundary.