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Open AccessArticle

Effect of 0.8 at.% H on the Mechanical Properties and Microstructure Evolution of a Ti–45Al–9Nb Alloy Under Uniaxial Tension at High Temperature

1
School of Mechanical Engineering, University of Jinan, Jinan 250022, China
2
Department of Mechanical Engineering, Shandong Jiaotong University, Jinan 250022, China
*
Authors to whom correspondence should be addressed.
Coatings 2020, 10(1), 52; https://doi.org/10.3390/coatings10010052
Received: 8 November 2019 / Revised: 19 December 2019 / Accepted: 24 December 2019 / Published: 7 January 2020
(This article belongs to the Special Issue Metal Surfaces)
To investigate the effect of hydrogen on the high-temperature deformation behaviors of TiAl-based alloys, the high-temperature tensile experiment was carried out on a Ti–45Al–9Nb (at.%) alloy with the H content of 0 and 0.8 at.%, respectively. Then, the effect of hydrogen on the high-temperature mechanical properties of the as-cast alloy was studied, the constitutive relations among stress, temperature, and strain rate were established, and the microstructure was analyzed. The results indicated that, compared with the unhydrogenated alloy, the flow stress of the hydrogenated alloy was significantly reduced, and the peak stress of the hydrogenated alloy decreased by (16.28 ± 0.17)% deformed at 1150 °C/0.0004 s−1. Due to the presence of hydride (TiAl)Hx in the alloy, the elongation showed a decline trend with increasing strain rate at the same deformation temperature. Compared with the unhydrogenated alloy, the elongation of the hydrogenated alloy reduced by (26.05 ± 0.45)% (0.0004 s−1), (23.49 ± 0.38)% (0.001 s−1), and (14.23 ± 0.19)% (0.0025 s−1), respectively, indicating that 0.8 at.% H softened the Ti–45Al–9Nb alloy and reduced the high-temperature plastic deformability. Under the same deformation condition, the deformation extent of the hydrogenated alloy was less than that of the unhydrogenated alloy. There were more residual lamellae in the hydrogenated alloy, and the extent of dynamic recrystallization was lower than that of the unhydrogenated alloy. View Full-Text
Keywords: TiAl-based alloys; hydrogen-induced softening; dynamic recrystallization; cracking TiAl-based alloys; hydrogen-induced softening; dynamic recrystallization; cracking
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Yu, Q.; Wen, D.; Wang, S.; Kong, B.; Wu, S.; Xiao, T. Effect of 0.8 at.% H on the Mechanical Properties and Microstructure Evolution of a Ti–45Al–9Nb Alloy Under Uniaxial Tension at High Temperature. Coatings 2020, 10, 52.

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