Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Role of alloying elements during thermocyclic oxidation of β/γ-TiAl alloys at high temperatures
Ist Teil von
Journal of alloys and compounds, 2017-01, Vol.691, p.489-497
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2017
Link zum Volltext
Quelle
ScienceDirect Journals (5 years ago - present)
Beschreibungen/Notizen
Gamma titanium aluminides are promising alloys known for their good mechanical properties and low densities, but their low oxidation resistance at high temperatures limits their application. This work discusses the thermocyclic oxidation behavior of newly developed β/γ-TiAl alloys at temperatures between 600 °C and 900 °C. An influence of β-stabilizing alloying elements like Nb and V on the oxidation of these alloys has been investigated here. The selected alloys are tested in an in-house developed thermocyclic furnace. The oxidation study is supported by gravimetric measurements along with Scanning Electron Microscopy (SEM) and Electron Diffraction Spectroscopy (EDS) mapping of the oxide layers. Additionally, phase formation after oxidation has been determined using X-Ray Diffraction (XRD). Results show that the Nb containing alloys are more oxidation resistant as compared to V containing alloys. The formation of a mixture of Al2O3 and TiO2 layers was found for all the alloys. Additionally, the oxide kinetics controlled the oxide growth and formation of various phases at different testing temperatures.
•Effect of various alloying elements on the oxidation of γ-TiAl alloy is studied.•Vanadium deteriorate the oxidation resistance due to formation of low temperature melting metal oxides.•Addition of Niobium improved oxidation resistance.•Microstructure of alloys effects the oxidation resistance.