Excellent dynamic mechanical properties of a newly developed titanium alloy with bimodal structure

In this work, a new dual-phase Ti-6Al-2Zr-2Mo-2 Nb-2Sn-1 V alloy was designed based on the classical Al -equivalent and Mo-equivalent design criteria, combined with the role of alloying elements in titanium alloys. The microstructure, microtexture and dynamic compressive properties of the alloy were studied systematically. A bimodal microstructure with 85 vol% & alpha; and 15 vol% & beta; phase was obtained after annealing treatment. The equiaxed & alpha; phase (& alpha;p) and & beta; phase conforms to Burgers orientation relationship (BOR), and part of lamellar & alpha; (& alpha;s) had similar orientations to the surrounding & alpha;p grains, resulting in the overlap of & alpha;p and & alpha;s texture components. The newly developed titanium alloy exhibited excellent dynamic compressive strength-plasticity-impact absorption energy matching, attributed to the coordinated deformation between & alpha; and & beta; phases as well as & alpha;p and transformed & beta; microstructure. The flow stress, plastic strain and impact energy at the critical failure strain rate of 4000 s-1 were 1586 MPa, 0.31 and 490 J/cm3, respectively. The dynamic mechanical properties of the new alloy are superior to those of typical titanium alloys and have the potential to be applied in high-strain rate environments. & COPY; 2023 Elsevier B.V. All rights reserved.