Fig. 1. Optical microstructures after cold rolling with different reductions: (a) 10%, (b) 20%, (c) 30%, (d) 40%, (e) 50%, (f) 60%.

Fig. 2. Microstructure analysis of samples with reductions of 10%-50%: (a)-(e) OM images; (f)-(j) Inverse pole figures (IPF); (k)-(o) Image quality maps (IQ map, — kink band, — twin); (p)-(t) Misorientation angle maps, the pink line represents the “point to origin” misorientation, which gives the orientation difference in reference to the origin. The blue lines reveal the “point to point” misorientation, which is the orientation difference between neighboring points (in the direction of the AB arrow).

Fig. 3. (a)-(b) Higher multiple selected area EBSD IPF maps of cold rolled sheets with 20% and 30% reductions; (c)-(f) Misorientation maps with 20% reduction, in the direction of white arrows AB, CD, EF and GH, respectively; (g) and (h) Misorientation maps under 30% reduction, in the direction of black arrows AB and CD; (i) and (j) Projection relationship of twins, kink bands and matrix with 20% and 30% reduction on the {332} pole figure, and the crystal cell model after rotation. (Among, the spots of different colors represent the distribution of twins, kinks and matrix transmission on the {332} pole figure. Such as, in figure (i), the red spots represent matrix, blue spots represent TP1, green spots represent TP2 and yellow spots represent kink band etc. In figure (j), the blue spots represent matrix, green spots represent kink band and red spots represent {332}TV1 etc.).

Fig. 4. Higher multiple selected area EBSD map of cold rolled sheet with 40% reduction. (a) IPF maps; (b) and (c) Projections of primary kink band, secondary kink band and kink band on (110) pole figure and corresponding crystal orientation change; (d)-(f) Projections of selection D1-D3 on (110) pole figure and crystal orientation change; (g) and (h) Misorientations along the arrow direction of A1A2 and B1B2 white dotted lines; (i)-(m) Misorientations of selection D1-D3 (in the direction of C1C2-G1G2).

Fig. 5. TEM images of the reduction 20%: (a) Bright-field image; (b) Enlarged selection dark-field image; (c) and (d) SAED of C1 and C2.

Fig. 6. TEM images of the reduction 30%: (a) Bright-field image; (b) Bark-field image; (d) HRTEM images of the reduction 30%; (e)-(i) Atomic arrangement and inverse Fourier transform image of E1-E5 selection.

Fig. 7. TEM images of the reduction 60%: (a) Bright field image of martensite; (b) Dark field image and selected area selected diffraction spots of martensite.

Fig. 8. Schematic illustration of the microstructural evolution of the TB8 alloy with an increase of reduction increases from 10% to 60%.

Fig. 9. (a) Engineering stress-strain curves with reduction of 10%-60%. (b) True stress-strain curve with reduction of 10%-60%.

Fig. 10. Tensile strength and elongation of TB8 titanium alloy cold rolled sheet.