The vacuum melted ɣ-TiAl (Nb, Cr, Si)-doped alloys and their cyclic oxidation properties
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Date
Authors
Mathabathe, Maria Ntsoaki
Bolokang, A.S.
Govender, S.
Mostert, Roelf Johannes
Siyasiya, Charles Witness
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
The γ-TiAl intermetallic alloy doped with Nb, Cr, and Si metals has been developed. It has emerged that the ternary Ti-48Al-2Nb and quinary Ti-48Al-2Nb-0.7Cr-0.3Si alloys yielded the best mechanical and cyclic oxidation properties. In particular, the quinary Ti-48Al-2Nb-0.7Cr-0.3Si alloy rapidly developed the protective stable Al2O3 oxide doped with nitrogen and titanium oxynitride during cyclic oxidation. This showed a lower hardness when compared to the other alloys after cyclic oxidation. The oxide layer proved to have a good adhesive relationship with the parent metal. The alloys microstructures were analysed with the scanning electron microscopy (SEM). The sample hardness test were conducted by Vickers hardness tester.
Description
Keywords
Scanning electron microscopy (SEM), Oxynitrides, Cyclic oxidation, Vacuum melted, Ti-48Al-2Nb-0.7Cr-0.3Si alloy, Ti-48Al-2Nb alloy, Titanium (Ti), Niobium alloys, Titanium oxynitride, Alumina, Aluminum alloys, Aluminum oxide, Chromium alloys, Oxidation, Silicon alloys, Ternary alloys, Titanium alloys, Vickers hardness, Lower hardness, Nb alloys, Oxide layer, Parent metal, Si alloys
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Citation
Mathabathe, M.N., Bolokang, A.S., Govender, G. et al. 2018, 'The vacuum melted ɣ-TiAl (Nb, Cr, Si)-doped alloys and their cyclic oxidation properties', Vacuum, vol. 154, pp. 82-89.