Deformability assessment of beta-solidifying TiAl-based alloy with Zr, Cr, and Gd content variability

Abstract

An experimental deformability assessment of a new six-component TiAl-based alloy Ti-44.5Al-2V-1Nb-(0.5…1.5)Zr/(1.5…2.5)Cr-(0…0.1Gd) (at.%) with variable Zr, Cr, and Gd content has been accomplished under the conditions of isothermal upsetting in accordance with the uniaxial compression scheme in the temperature range 1000–1300°C and strain rates of 0.001–0.1 s−1. It has been revealed that Cr-containing compositions possess significantly higher technological plasticity compared to Zr-containing compositions. Microadditions of Gd in the amount of 0.1 at.% also promote the reduction of stresses upon deformation. It is shown that with the upsetting temperature increase, the stress values decrease in the entire range of deformation rates. It has been established that the most noticeable decrease in stress levels is observed with an increase in the compression temperature from 1100 to 1200 °C – by 2…2.5 times, while with an increase in the compression temperature from 1000 to 1100 °C – only by 1.1…1.3 times, and from 1200 to 1300 °C – by 1.4…1.5 times.