Thermal deformation behavior of γ-TiAl based alloy by plasma hydrogenation

Published on Nov 27, 2020in International Journal of Hydrogen Energy4.939
· DOI :10.1016/J.IJHYDENE.2020.09.008
Fuyu Dong6
Estimated H-index: 6
,
Liu Yongda + 8 AuthorsJun Cheng1
Estimated H-index: 1
Source
Abstract
Abstract The Ti–48Al–2Cr alloy was subjected to the plasma-hydrogenation treatment. Then the alloy containing minor hydrogen was prepared (0.058 wt percent, wt.%). Hot-compression experiments were carried out at temperatures ranging from 1000 to 1,150 °C and strain rates ranging from 1 to 0.001 s−1. The results show that the peak stress after the plasma-hydrogenation treatment is lower than that of the unhydrogenated one. At 1100 °C and the strain rate of 0.01 s−1, the peak stress is reduced by 32.3%. The mechanism of high-temperature softening caused by plasma-hydrogenation is examined, and the constitutive equations are established for the unhydrogenated and hydrogenated alloys. Through the constitutive equations, the high-temperature softening mechanism of unhydrogenated and hydrogenated alloys are dynamic-recrystallization, and the activation energy of hydrogenated alloy is lower than that of the unhydrogenated. Meanwhile, electron back-scatter diffraction analyses of the thermal-compressed microstructures show that the hydrogenated alloy has more recrystallized grains, less lamellar structure, and more uniform deformation than the unhydrogenated alloy.
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