Ti-6Zr-6Nb-6Sn 합금의 고온 변형 거동에 관한 연구

Abstract

High temperature deformation behavior of Ti-6Zr-6Nb-6Sn alloy was studied using compression test at strain rates from 0.001s^(-1) to 10s^(-1) and at temperature from 650℃ to 900℃. High temperature deformation efficiency has been evaluated following the Prasad et al.`s model and flow instability condition has been also estimated according to the Kumar et al.`s model. The results showed that a dynamic recrystallization of α and β-grain is primarily responsible for high deformation efficiency and that an unstable flow condition is closely related with the formation of deformation shear band. The optimum working condition has been estimated to be the strain rate 10s^(-1) at the temperature 750℃, which results in a fine and equiaxed α + β duplex microstructure.