A review of microstructure and texture evolution during plastic deformation and heat treatment of β-Ti alloys

In the present work, microstructure and texture evolution during plastic deformation and annealing treatment of near beta (beta), meta-stable beta, and stable beta-Ti alloys are reviewed. The evolution of micro structural features such as shear bands (SBs), martensite (alpha ''/alpha '), dislocations and precipitation (omega (omega), and alpha (alpha) phases) during plastic deformations significantly influence the mechanical properties. Further, the microstructure and texture evolution in the deformed beta-Ti alloys also depend on the deformation process like rolling, extrusion, and/or severe plastic deformation (SPD). The formation of alpha-fiber (RD// <110>) and gamma-fiber (ND// <111>) are typically observed in cold-rolled and recrystallized beta-Ti alloys. However, the fiber texture intensities or the volume fraction of these fibers and other texture components (Cube (100) <001>, Rotated Cube (100) <011>, Goss (110) <001> and others) varies from process to process. Dynamic recrystallization (DRX) and dynamic recovery (DRV) are influenced mainly by the imposed strain rate, activated deformation modes, and deformation temperature in beta-Ti alloys. In general, the activation of deformation mechanisms viz. slipping, twinning, kinking, and SBs formation are primarily dependent on the reduction ratio and the composition of the beta-Ti alloys. The formation of SBs and deformation twins contributes to the ductility of the beta-Ti alloy sheets for structural/automotive applications. Moreover, the presence of alpha ''/alpha ' and omega-phase showed an improvement in the strength of beta-Ti alloys. beta-Ti alloys such as TiNb alloys are known for their acceptable biocompatibility and low young's modulus (E, 40-65 GPa). However, the formation of alpha '/alpha '' during plastic deformation leads to lowering of E. (c) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study reviews the microstructure and texture evolution of near beta, meta-stable beta, and stable beta-Ti alloys during plastic deformation and annealing treatment. Factors such as shear bands, martensite, dislocations, and precipitation significantly affect mechanical properties, while the deformation process influences microstructure and texture evolution. The activation of deformation mechanisms and presence of certain phases impact the ductility and strength of beta-Ti alloys, demonstrating the complexity of their mechanical behavior.