The dynamic response of the metastable β titanium alloy Ti-2Al-9.2Mo-2Fe at ambient temperature

The mechanical behavior of a metastable beta titanium alloy, Ti-2Al-9.2Mo-2Fe (wt%), was studied through high compression strain rate (similar to 3000 s(-1)) at ambient temperature by Spilt Hopkinson Pressure Bar (SHPB) tests after solution treatment at 850 degrees C for 0.5 h and 950 degrees C for 1 h. The mechanism of deformation and microstructure evolution was investigated by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Multiple deformation mechanisms, including primary and secondary {332} twinning, stress-induced martensite, and stress-induced omega-phase and dislocation slips, were identified in specimens subjected to solution treatment at 850 degrees C for 0.5 h. In contrast, only primary and secondary {332} twinning and dislocation slips were detected in specimens subjected to solution treatment at 950 degrees C for 1 h. The athermal omega precipitation produced after solution treatment and elevated temperature generated during dynamic loading played a crucial role in the different deformation mechanisms observed in the two different specimens. Moreover, the deformation mechanisms active during plastic deformation in the different strain regimes affected the development of different textures in the Ti-2Al-9.2Mo-2Fe alloys from each regime.