TiB particle-stimulated nucleation of recrystallization behavior in a novel Ti-Mo-Fe biomedical titanium alloy

Abstract

Background: Beta titanium alloys are widely used in biomedical implants because of their high strength and low modulus, for example, Ti-Mo-Fe based alloys exhibit superior mechanical properties and are good condidates for bone implants. A novel biomedical Ti-9.2Mo-2Fe-0.1B (wt.%) beta titanium alloy was developed for biomedical purpose. Therefore, in this study, we investigated the microstrucural evolution of the novel alloy in the early stage of annealing to understand its static recrystallization behavior.

Methods: The alloy samples were cold compressed and then subjected to a beta solution treatment for a short time. The microstructural and textural evolution at the early-stage of static recrystallization were investigated by using electron backscatter diffraction (EBSD) technique.

Results: EBSD observations reveal that new grains/subgrians are nucleated in particles deformation zones that were the beta matrix and twins surrounded with TiB particles. High angle grain boundaries were formed between the recystallized grains and subgrains via various lattice rotation. The recrystallized microstructures exhibited weakened textures in the beta solution-treated Ti-9.2Mo-2Fe-0.1B alloy.

Conclusions: The PSN mechanism is the main recrystallization mechanism in the early stage of static recrystallization. Multiple grains/subgrains are nucleated in the matrix and twins in the vicinty of TiB particles by the lattice rotation. The random rotation leads to formation of large angle grain boundaries and weaken recystallization textures.