The Effect of a Taper Angle on Micro-Compression Testing of Mo-B-C Coatings

This research was devoted to studying the influence of the taper angle on the micro-compression of micro-pillars fabricated from near-amorphous and nanocrystalline Mo-B-C coatings. A series of micro-pillars with a taper angle between 4–14° was fabricated by focused ion beam technique. The deformatio...

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Bibliographic Details
Published in:Materials 2020-07, Vol.13 (14), p.3054
Main Authors: Zábranský, Lukáš, Bernátová, Katarína, Dluhoš, Jiří, Váňa, Rostislav, Souček, Pavel, Vašina, Petr, Buršíková, Vilma
Format: Article
Language:English
Subjects:
Coatings
Compliance
Compression tests
Deformation
Deformation mechanisms
Ductility
Ion beams
Mechanical properties
Modulus of elasticity
Nanoindentation
Tapering
Yield strength
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Summary:This research was devoted to studying the influence of the taper angle on the micro-compression of micro-pillars fabricated from near-amorphous and nanocrystalline Mo-B-C coatings. A series of micro-pillars with a taper angle between 4–14° was fabricated by focused ion beam technique. The deformation mechanism was found to be dependent on the taper and, also, on the crystallinity of the coating. In order to obtain correct values of yield strength and Young’s modulus, three empirical models of stress correction were experimentally tested, and the results were compared with nanoindentation measurements. It was shown that the average stress correction model provided comparable results with nanoindentation for the yield strength for taper angles up to ~10°. On the other hand, the average radius or area model gave the most precise results for Young’s modulus if the taper angle was
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13143054