In-situ microstructural investigations of the TRIP-to-TWIP evolution in Ti-Mo-Zr alloys as a function of Zr concentration

Aiming at overcoming the strength-ductility trade-off in structural Ti-alloys, a new family of TRIP/TWIP Ti-alloys was developed past decade (TWIP: twinning-induced plasticity; TRIP: transformation-induced plasticity). Herein, we study tunable nature deformation mechanisms with various TWIP and TRIP contributions by fine adjustment Zr content on ternary Ti-12Mo-xZr (x = 3, 6, 10) alloys. The microstructure Ti-Mo-Zr alloys are explored using in-situ electron backscatter diffraction (EBSD) transmission microscopy (TEM). results show that transition dominant mode occurred, going from to major mechanism increasing content. In Ti-12Mo-3Zr alloy, stress-induced martensitic transformation (SIM) is which accommodates plastic flow. Regarding Ti-12Mo-6Zr combined twinning (DT) SIM modes both contribute overall plasticity enhanced strain-hardening rate subsequent large uniform ductility. Further increase Ti-12Mo-10Zr alloy leads an improved yield stress involving single DT as throughout regime. present work, set comprehensive ex-situ microstructural investigations clarify evolution microstructures during tensile loading unloading processes.