Comparison of nanoindentation results obtained with Berkovich and cube-corner indenters

Chudoba, Thomas; Schwaller, Patrick; Rabe, R.; Breguet, J.-M.; Michler, Johann (2006). Comparison of nanoindentation results obtained with Berkovich and cube-corner indenters Philosophical Magazine, 86(33-35), pp. 5265-5283. Taylor & Francis 10.1080/14786430600746424

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There is increasing interest in using sharp cube corner indenters in nanoindentation experiments to study plastic properties. In combination with finite element methods it is for instance possible to extract stress-strain curves from load-displacement curves measured with differently shaped pyramidal indenters. Another example is the fracture toughness of coatings, which can be studied using cracks produced during indentation with cube corner tips. We have carried out indentation experiments with Berkovich and cube corner indenters on eight different materials with different mechanical properties. To gain information about the formation of pile-up and cracks, indentation experiments with cube corner indenter were performed inside a Scanning Electron Microscope (SEM) using a custom-built SEMMicroindenter. The results show that reliable hardness and modulus values can be measured using cube corner indenters. However, the fit range of the unloading curve has a much bigger influence on the results for the cube corner than for the Berkovich tip. The unloading curves of a cube corner measurement should therefore be carefully inspected to determine the region of smooth curvature and the unloading fit range chosen warily. Comparison of the modulus results shows that there is no significant difference between cube corner and Berkovich measurements. Also for hardness, no fundamental difference is observed for most of the investigated materials. Exceptions are materials like silicon nitride, cemented carbide or glassy carbon, where a clear difference to the hardness reference value has been observed although the modulus difference is not pronounced.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Engineering and Computer Science > Institute for Surface Applied Laser, Phototonics and Surface Technologies ALPS School of Engineering and Computer Science
Name:	Chudoba, Thomas; Schwaller, Patrick; Rabe, R.; Breguet, J.-M. and Michler, Johann
ISSN:	1478-6435
Publisher:	Taylor & Francis
Language:	English
Submitter:	Patrick Schwaller
Date Deposited:	25 Mar 2020 12:53
Last Modified:	25 Mar 2020 12:53
Publisher DOI:	10.1080/14786430600746424
ARBOR DOI:	10.24451/arbor.9297
URI:	https://arbor.bfh.ch/id/eprint/9297