Cyclic oxidation behaviour of Ti3Al-based alloy with Ni-Cr protective layer

The influence of a thin 80Ni-20Cr (at.%) protective coating on the cyclic oxidation of a Ti-24Al-11Nb (at.%) alloy based on Ti3Al at 600 and 900 deg C in air was investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction analysis (XRD). The resu...

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Bibliographic Details
Published in:Corrosion science 2008-07, Vol.50 (7), p.1919-1925
Main Authors: CVIJOVIC, I, JOVANOVIC, M. T, PERUSKO, D
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion environments
Exact sciences and technology
Fractures
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Production techniques
Surface treatment
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Summary:The influence of a thin 80Ni-20Cr (at.%) protective coating on the cyclic oxidation of a Ti-24Al-11Nb (at.%) alloy based on Ti3Al at 600 and 900 deg C in air was investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction analysis (XRD). The results of the oxidation tests showed that deposited Ni-Cr layer provides an improved oxidation resistance due to the formation of protective oxide scale which barriers the outward Ti diffusion into the scale. In some extent surface formation of the nitride layer also prevents diffusion of alloying elements from the matrix. Although oxidation at 900 deg C is faster than that at 600 deg C, a remarkable reduction in mass gain of the alloy with protective coating was observed. The thickness of oxide scale on the coated samples is approximately two times less than that formed on the uncoated samples treated under the same exposure conditions (120 h).
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2008.04.006