Alpha-beta Ti alloys often show pronounced softening during hot deformation. This softening is often attributed to globularisation of the α-phase, which is thought to occur by a kind of recrystallization mechanism, driven by deformation . However, recent detailed texture and microtexture studies have suggested that this behaviour might instead be due to dynamic phase transformation . The lack of a clear explanation is caused in part by the difficulty in interpreting the post-mortem microstructures in these alloy systems. On cooling, the β-phase transforms almost entirely into α, obscuring the deformed microstructure. Unfortunately, softening can only be seen at relatively high strain rates and large strains, making in-situ electron microscopy studies impractical. To avoid these difficulties, we used synchrotron diffraction to measure the internal strains, phase fraction and texture during hot tensile deformation of Ti-64 specimens. Using resistance heating and a fast acquisition rate (10 Hz), we were able to measure the microstructure evolution at a strain rate of about 0.1 /s at different temperatures and therefore different α/β phase contents. Our results showed direct evidence of dynamic phase transformation, during which the texture evolves by a kind of variant selection. Elastic strain measurements suggest that this variant selection is caused by the disappearance of highly stressed α variants during deformation. This finding has important consequences for understanding and controlling the microstructure development in dual-phase Ti alloys during thermomechanical processing.
 E. B. Shell and S. L. Semiatin, “Effect of initial microstructure on plastic flow and dynamic globularization during hot working of Ti-6Al-4V,” Metall. Mater. Trans. A, vol. 30, no. 12, pp. 3219–3229, Dec. 1999.
 B. Guo, S. L. Semiatin, J. J. Jonas, and S. Yue, “Dynamic transformation of Ti–6Al–4V during torsion in the two-phase region,” J. Mater. Sci., vol. 53, no. 12, pp. 9305–9315, Jun. 2018.
 B. Guo, S. L. Semiatin, J. Liang, B. Sun, and J. J. Jonas, “Opposing and Driving Forces Associated with the Dynamic Transformation of Ti-6Al-4V,” Metall. Mater. Trans. A Phys. Metall. Mater. Sci., vol. 49, no. 5, pp. 1–5, 2018.