Jones, H; Gee, M (2023) Micro-Cantilever Testing of Engineering Coatings. NPL Report. MAT 118
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Text (NPL Report MAT 118)
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Abstract
The feasibility of using micro-mechanical testing of small cantilevers micro-machined from coated samples was explored. Two types of samples were fabricated. Cantilevers from a sample with a thin (few micrometre) TiN coating were fabricated with the cantilevers parallel to the surface of the coating. Cantilevers from a sample with a thick (50 micrometres) W based coating were fabricated with the interface at the base (highest stress position) of the cantilever. All the cantilevers were tested in situ in the SEM using an in situ nanoindenter to load the end of the cantilever. Load displacement curves were captured for all the tests and the measured cantilever geometry was used to calculate stress strain curves. Variability in results was shown for all the tests due to variation in cantilever geometry and microstructural effects. Interfacial failure was seen for only one of the cantilevers testing the interface in the W based coating with the rest showing significant plastic deformation.
Item Type: | Report/Guide (NPL Report) |
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NPL Report No.: | MAT 118 |
Keywords: | Micromechanical testing; coatings; cantilever testing |
Subjects: | Advanced Materials > Surface Engineering |
Divisions: | Materials and Mechanical Metrology |
Identification number/DOI: | 10.47120/npl.9777 |
Last Modified: | 05 Jul 2023 08:38 |
URI: | http://eprintspublications.npl.co.uk/id/eprint/9777 |
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