Abstract
Ni-Cr and Ti-Si layers were deposited by magnetron sputtering on Ti-46Al-8Nb (at.%) substrates to suppress penetration of gases, which brings about undesirable changes in mechanical properties. Alloy samples with and without surface protection were subjected to interrupted oxidation at elevated temperature (700 and 800 °C) for up to 300 h. Selected mechanical properties as well as adhesion of surface layers were examined in the as-received and oxidized state. Analytical techniques used to characterize surfaces and cross sections of the samples included scanning electron microscopy and light microscopy, energy-dispersive x-ray spectroscopy, x-ray photoelectron spectroscopy and x-ray diffraction. Both investigated layers were sufficiently adherent and effective in hindering gas absorption at 700 °C; however, only Ni-Cr showed promising properties for higher-temperature applications.
Highlights
IntroductionAlloys based on titanium aluminides are reckoned promising lightweight materials (density of about 4.0 g/cm3) with good mechanical properties and oxidation resistance (Ref 1-5)
Alloys based on titanium aluminides are reckoned promising lightweight materials with good mechanical properties and oxidation resistance (Ref 1-5)
The oxidation behavior of these samples was tested in air at 700 and 800 °C during 80 h
Summary
Alloys based on titanium aluminides are reckoned promising lightweight materials (density of about 4.0 g/cm3) with good mechanical properties and oxidation resistance (Ref 1-5). They might partly replace Ni-superalloys in gas turbine engines (Ref 6), contributing to a 20-30% reduction in total weight and remarkable decrease in fuel consumption. In spite of a number of interesting properties, the application of TiAl alloys is still limited because of their relatively low ductility at room temperature (Ref 7), insufficient oxidation resistance at temperatures exceeding 800 °C (Ref 8) and abrupt embrittlement after short exposure to oxidizing environments at elevated temperatures (Ref 9, 10). The most common appeared alloying and surface treatment
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