Corrosion behavior of single- and poly-crystalline dual-phase TiAl–Ti<sub>3</sub>Al alloy in NaCl solution

Dongpeng Wang; Guang Chen; Anding Wang; Yuxin Wang; Yanxin Qiao; Zhenguang Liu; Zhixiang Qi; Chain Tsuan Liu

doi:10.1007/s12613-022-2513-5

Volume 30 Issue 4

Apr. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(4): 689-696

Dongpeng Wang, Guang Chen, Anding Wang, Yuxin Wang, Yanxin Qiao, Zhenguang Liu, Zhixiang Qi, and Chain Tsuan Liu, Corrosion behavior of single- and poly-crystalline dual-phase TiAl–Ti₃Al alloy in NaCl solution, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 689-696. https://doi.org/10.1007/s12613-022-2513-5

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Dongpeng Wang, Guang Chen, Anding Wang, Yuxin Wang, Yanxin Qiao, Zhenguang Liu, Zhixiang Qi, and Chain Tsuan Liu, Corrosion behavior of single- and poly-crystalline dual-phase TiAl–Ti3Al alloy in NaCl solution, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 689-696. https://doi.org/10.1007/s12613-022-2513-5

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Research Article

Corrosion behavior of single- and poly-crystalline dual-phase TiAl–Ti₃Al alloy in NaCl solution

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Corresponding authors:
Dongpeng Wang E-mail: dpwang@just.edu.cn

Yuxin Wang E-mail: ywan943@163.com
Received: 21 January 2022; Revised: 8 May 2022; Accepted: 9 May 2022; Available online: 11 May 2022

Abstract

Abstract

To clarify the correlation of single-crystalline structure with corrosion performance in high-strength TiAl alloys, electrochemical and surface characterization was performed by comparing Ti–45Al–8Nb dual-phase single crystals with their polycrystalline counterparts in NaCl solution. Polarization curves show a lower corrosion rate and a higher pitting potential of ~280 mV for the dual-phase single crystals. Electrochemical impedance spectroscopy and potentiostatic polarization plots revealed a higher impedance of the charge transfer through the compact passive film. Surface composition analysis indicated a compact film with more content of Nb, as twice as that in the film on the polycrystals. Our results reflect that the dual-phase Ti–45Al–8Nb single crystals possess a higher corrosion resistance in NaCl solution, compared with their polycrystalline counterpart, arising from a more homogeneous microstructure and composition distribution.
- titanium alloy;
- single crystal;
- corrosion;
- X-ray photoelectron spectroscopy

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