Formation of nanocrystalline β structure in metastable beta Ti alloy during high pressure torsion: The role played by stress induced martensitic transformation

Formation of slip bands and microstructure evolution of Ti-5Al-5Mo-5V-3Cr-0.5Fe alloy during warm deformation process

“…Metastable β titanium alloys are important structural materials for aeronautical applications due to their high strength to density ratio, superior strength and ductility combination and good workability [1,2,3,4]. Thereupon enormous work and effort in resolving the complex microstructural evolution related to thermomechanical process (TMP) and their correlations with the resultant mechanical properties have been done in the past decades [5,6,7,8]. Various alloy compositions and microstructures of titanium alloys are related to the different deformation mechanisms.…”

Microstructure evolution and superelastic behavior in Ti-35Nb-2Ta-3Zr alloy processed by friction stir processing

“…Meanwhile, many cavities induced by grain boundary sliding are distinctly observed in the SZ ( According to our knowledge, HAZ experiences a thermal cycle, but does not undergo any plastic deformation. It is also reported that martensitic transformation could be induced under applied force such as high pressure torsion and one dimensional shock loading [40][41]. It is known that during friction stir processing, high plunge depth results in high forces perpendicular to the friction stir processed surface, which ultimately induces the martensitic transformation as observed above.…”

Room temperature creep behavior of Ti–Nb–Ta–Zr–O alloy

“…The size of the α" phase in EP0.85 is much finer than that in EP0.0. Zafari et al [31] reported that the Gibbs free energy of the system increases rapidly with decreasing thickness below~5-10 nm. In other words, an α" plate with a thickness of b~10 nm would become unstable, and tend to transform back into β.…”