The Effect of Lamellar and Globular α-Phase on Mechanical Behavior of Strongly Textured Ti–6Al–4V alloy

Abstract

In this study, the effect of lamellar and globular α-phase on mechanical properties of strongly textured Ti–6Al–4V alloy was investigated. The strong transverse texture was developed in Ti–6Al–4V alloy via α + β rolling at 950 °C. In the following, lamellar and equiaxed microstructures have been separately promoted in the Ti–6Al–4V alloy during annealing at β- and α + β regions, respectively. According to EBSD analysis, it was revealed that deformation texture was not considerably changed during different annealing processes. Then, room temperature mechanical properties of the studied alloy including uniaxial tensile, compression and bending tests were evaluated. According to the tensile test, work hardening capacity was obtained as 1.10 and 0.64 for equiaxed and lamellar microstructures, respectively. Fracture limit curve revealed that equiaxed microstructure had more extent of homogeneous deformation in comparison with lamellar one. In addition, bending properties of the Ti–6Al–4V alloy were significantly improved as a result of equiaxed microstructure.