Abstract
TiAl alloys with Al contents of 30.7, 37, 46.5, and 54.2 at.% were carburized. Corrosion resistance of the untreated and the carburized TiAl alloys was comparatively analyzed. The phase and microstructure of the carburized TiAl alloys were studied by x-ray diffraction and scanning electron microscopy, respectively. Electrochemical corrosion behavior of the untreated and the carburized TiAl alloys was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy. Experimental results indicate that different Al contents bring about distinct microstructure of the carburized layers. The lower Al content leads to the formation of the thicker binary carbides and the thinner Ti2AlC phase. Additionally, the lower Al content leads to higher corrosion resistance in the untreated and the carburized states.
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Acknowledgments
This research was financially supported by the National Natural Science Foundation of China (Nos. 51505141 and 51375161), state science and technology support program (2012BAC02B05), General Project of Hunan provincial education department (14C0322), and school-level project of Hunan University of Technology (2014HZX08).
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Liao, C.J., He, Y.H. & Ming, X.Z. Effects of Al Contents on Carburization Behavior and Corrosion Resistance of TiAl Alloys. J. of Materi Eng and Perform 24, 4083–4089 (2015). https://doi.org/10.1007/s11665-015-1708-6
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DOI: https://doi.org/10.1007/s11665-015-1708-6