Hot deformation behavior of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy with acicular microstructure |
| |
Authors: | Gao-feng Liu Shang-zhou Zhang Li-qing Chen |
| |
Affiliation: | (1) Northwestern Polytechnical University, Xi’an, 710072, P.R. China;(2) Beijing Aeronautical Manufacturing Technology Research Institute, Beijing, 100024, P.R. China |
| |
Abstract: | The characteristics of hot deformation of an α+β titanium alloy Ti-6.5Al-3.5Mo-1.5Zr-0.3Si with acicular microstructure were studied using isothermal hot compressive tests in a strain rate range of 0.01–10 s−1 at 860–1 100 °C. The true stress-true strain curves of alloy hot-compressed in the α+β region exhibit a peak stress followed by continuous flow softening; whereas in the β region, the flow stress attains a steady-state regime. At a strain rate of 10 s−1 and in a wide temperature range, the alloy exhibits plastic flow instability. According to the kinetic rate equation, the apparent activation energies are estimated to be about 633 kJ/mol in the α+β region and 281 kJ/mol in the β region, respectively. The processing maps show a domain of the globularization process of α colony structure and α dynamic recrystallization in the temperature range of 860–960 °C with a peak efficiency of about 60%, and a domain of β dynamic recrystallization in the β region with a peak efficiency of 80%. |
| |
Keywords: | titanium alloy Ti-6.5Al-3.5Mo-1.5Zr-0.3Si hot compression flow behavior microstructure |
本文献已被 CNKI 维普 SpringerLink 等数据库收录! |
|