Mathabathe, Maria NtsoakiBolokang, A.S.Govender, S.Mostert, Roelf JohannesSiyasiya, Charles Witness2018-06-012018-08Mathabathe, 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. 82-89.0042-207X (print)1879-2715 (online)10.1016/j.vacuum.2018.04.055http://hdl.handle.net/2263/65055The 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.en© 2018 Elsevier Ltd. Notice : this is the author’s version of a work that was accepted for publication in Vacuum. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Vacuum, vol. 154, pp. 82-89, 2018. doi : 10.1016/j.vacuum.2018.04.055.Scanning electron microscopy (SEM)OxynitridesCyclic oxidationVacuum meltedTi-48Al-2Nb-0.7Cr-0.3Si alloyTi-48Al-2Nb alloyTitanium (Ti)Niobium alloysTitanium oxynitrideAluminaAluminum alloysAluminum oxideChromium alloysOxidationSilicon alloysTernary alloysTitanium alloysVickers hardnessLower hardnessNb alloysOxide layerParent metalSi alloysSDG-09: Industry, innovation and infrastructureSDG-09: Industry, innovation and infrastructureSDG-12: Responsible consumption and productionSDG-12: Responsible consumption and productionSDG-13: Climate actionSDG-13: Climate actionThe vacuum melted ɣ-TiAl (Nb, Cr, Si)-doped alloys and their cyclic oxidation propertiesPostprint Article