Fig. 1. Typical microstructure morphology of Ti-55511 alloy deformed at 900 °C (ε = 0.6,ε˙=0.1 s-1) and cooled at 25 °C/s. (a) and (b) are the IPFZ and band contrast maps. Black and white lines in (a) and (b) represent the high angle and low angle boundaries, respectively. (c) and (d) show the point-to-point misorientation profiles along the red arrow and black arrow shown in (a).

Fig. 2. IPF and BC maps of the corresponding microstructures at different cooling rates and interrupt temperatures.

Fig. 3. Distribution of misorientation angle and the change of microstructure characteristics under different cooling rates and interrupt temperatures. (a) MAD, (b) the distribution of the β-average grain size, the percentage content of α-phase, the percentage content of LAGBs, and the SRX percentage.

Fig. 4. KAM diagrams corresponding to different cooling rates and interrupt temperatures.

Fig. 5. IPF maps of the corresponding local microstructure at 0.1 °C/s-560 °C. (a) IPF map of α / β, (b) IPF map of GBαs.

Fig. 6. Pole figures of the five adjacent β grains and GBαs at 0.1 °C/s-560 °C.

Fig. 7. BC maps and Phase maps corresponding to the microstructure at slower cooling rates and interruption temperatures (LAGBs of 2°-15° in BC maps are indicated by white lines, 15°-30° by black lines, 30°-45° by red lines, 45°-60° by blue lines, and 60°-90° by green lines in Fig. 7(a-c)).

Fig. 8. Distribution of α / β misorientation angles (MAD) at slower cooling rates (0.1 and 0.05 °C/s).

Fig. 9. IPF maps of α / β at 0.1 °C/s-450 °C (a, b, c, f). Pole figures corresponding to {0001} and {11-20} α and {110} and {111} β in region I (d, e). Pole figures corresponding to α / β in region II (g).

Fig. 10. IPF maps of α / β at 0.05 °C/s-560 °C (a, b, c, e). Pole figures corresponding to {0001} and {11-20} α and {110} and {111} β in region III (d). Pole figures corresponding to α / β in region IV (f).

Fig. 11. IGMA distributions of β / α at slower cooling rates (0.1 and 0.05 °C/s).

Fig. 12. Fold-line statistical distribution of the thickness and length of GBα thickness, αWGB for cooling speeds of 1.0, 0.5, 0.1, and 0.05 °C/s.

Fig. 13. The schematic representation of α-phase nucleation and continuous growth with different cooling times. (a) 0.5 °C/s, (b) 0.1 °C/s, (c) 0.05 °C/s.

Fig. 14. Inverse pole figures (CD//TD//Y in the CD) and pole figures corresponding to the cooling rates of 25, 1.0 and 0.05 °C/s.

Fig. 15. Orientation Distribution Function (ODF) three-dimensional stereogram and φ1-ϕ two-dimensional plane profiles corresponding to the cooling rate of 25 °C/s of β with the standard ODF graph of BCC (a, b), 1.0 °C/s of β and 0.05 °C/s of β / α (c), respectively, in a coordinate system established with three Euler angles φ1, ϕ, and φ2, respectively.