Deformation of Hard Coatings at Elevated Temperatures

The elevated temperature performance of a wide range of chromium nitride-based hard coatings was evaluated using in situ micro-compression in the scanning electron microscope. This allows the first direct measurement of the high temperature compressive strength, rather than the hardness, of such coa...

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Bibliographic Details
Published in:Surface & coatings technology 2014-09, Vol.254, p.382-387
Main Authors: Wheeler, J.M., Raghavan, R., Chawla, V., Morstein, M., Michler, J.
Format: Article
Language:English
Subjects:
Applied sciences
Chromium
Coatings
Cross-disciplinary physics: materials science
rheology
Deformation
Electron microscopy
Exact sciences and technology
Hard coatings
Hard surfacing
High temperature
Materials science
Metals. Metallurgy
Micro-compression
Microstructure
Nitrides
Physics
Production techniques
Scanning electron microscopy
Surface treatment
Surface treatments
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Summary:The elevated temperature performance of a wide range of chromium nitride-based hard coatings was evaluated using in situ micro-compression in the scanning electron microscope. This allows the first direct measurement of the high temperature compressive strength, rather than the hardness, of such coatings. The microstructure of the coatings was analyzed using X-ray diffraction and focused ion beam cross sectioning followed by electron microscopy. Micropillars were examined using electron microscopy before, during and after compression. Trends in deformation behavior and failure stress with temperature are discussed in relation to the coatings' microstructures and their room temperature mechanical properties. •Measurement of high temperature compressive strength of CrN-based hard coatings•Good agreement between RT nanoindentation and micro-compression rankings•Addition of Ti and Si decreases temperature dependence of failure stress.•AlCrTiSiN coating shows highest strength at all temperatures.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2014.06.048