About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
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Presentation Title |
Analyzing Thin Film Strength and Thermo-mechanical Behavior by Wedge Indentation and Bi-metal Beams |
Author(s) |
Daniel Kiener, Markus Alfreider, Benjamin Seligmann |
On-Site Speaker (Planned) |
Daniel Kiener |
Abstract Scope |
Nanoindentation was developed as method of choice to analyze thin films and surface layers. Several years later, focused ion beam (FIB) machined micro pillars were developed to eliminate the constrained deformation under the indenter tip to facilitate mechanical interpretation of confined volume plasticity.
Here, we utilize FIB technology to prepare cross-sectional lamellas and bi-metal beams, which are subsequently wedge indented or thermo-mechanically loaded in-situ in a scanning electron microscope at ambient and elevated temperatures. The quasi-2D wedge indentation allows testing of the thin film on a substrate, with direct access to the actual contact area and the flow field under the indenter wedge by digital image correlation. The bi-metal beams facilitate local determination of thermal and residual stresses as well as their evolution with thermal cycling. Combining these novel nanoindentation-derived testing techniques, we attempt to provide a new strategy to access thermo-mechanical properties of thin films. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Thin Films and Interfaces, Characterization |