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Aiming at increasing the yield strength of transformation and twinninginduced plasticity (TRIP and TWIP) titanium alloys, a dual-phase$\alpha$/$\beta$ alloy is designed and studied. The composition Ti 7Cr 1.5Sn(wt.%) is proposed, based on an approach coupling Calphad calculations andclassical Bo-Md design tool used in Ti-alloys. Its microstructure is made of20% of $\alpha$ precipitates in a $\beta$ matrix, the matrix having optimal Boand Md parameters for deformation twinning and martensitic transformation. Thealloy indeed displays a yield strength of 760 MPa, about 200 MPa above that ofa Ti 8.5Cr 1.5Sn (wt.%) single beta phase TRIP/TWIP alloy, combined with goodductility and work-hardening. In situ synchrotron X ray diffraction andpost-mortem electron back-scattered analyses are performed to characterize thedeformation mechanisms. They evidence that the TRIP and TWIP mechanisms aresuccessfully obtained in the material, validating the design strategy. Theinteraction of the precipitates with the {332}<113> $\beta$ twins is analyzed,evidencing that the precipitates are sheared when hit by a twin, and thereforedo not hinder the propagation of the twins. The detailed nature of theinteraction is discussed, as well as the impact of the precipitates on themechanical properties.

From single phase to dual-phase TRIP-TWIP titanium alloys for the improvement of the yield strength