High-temperature deformation behaviors of Ti-2Al-9.2Mo-2Fe alloy with boron

Hot deformation behaviors of Ti-2Al-9.2Mo2Fe alloy with boron were investigated in a hot compression test at temperatures ranging from 850 to 1000 degrees C and strain rates ranging from 0.01 to 10.00 s(-1). With strain rate decreasing and deformation temperature increasing, dynamic recrystallization (DRX) was promoted in both alloys. The nucleation mechanism of DRX involved grain boundary bulging and subgrain rotation. In case of deformation at low temperatures and high strain rates, the boronfree alloy only showed dynamic recovery (DRV) phenomenon. However, due to the particle-stimulated nucleation mechanism of recrystallization by TiB particles, the boron-containing alloy shows DRX at that condition. These DRX grain nuclei are formed by lattice rotation and subgrain growth from deformation zone in the initial grains, which are close to those of TiB particle. Moreover, the flow stress of the boron-containing alloy is lower than that of the boron-free alloy due to the grain refinement during hot deformation process.

Automated summary

The hot deformation behaviors of Ti-2Al-9.2Mo2Fe alloy with boron were investigated at different temperatures and strain rates. Both alloys showed dynamic recrystallization (DRX) with decreasing strain rate and increasing deformation temperature. The mechanisms of DRX involved grain boundary bulging and subgrain rotation. The boron-containing alloy exhibited DRX due to the particle-stimulated nucleation mechanism, while the boron-free alloy only showed dynamic recovery (DRV) phenomenon.