About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
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Presentation Title |
NOW ON-DEMAND ONLY - Nanoindentation of Zoned Radiation-damaged Zircon: Micro-pillar Splitting and Mechanical Properties Mapping |
Author(s) |
Tobias Beirau, Edoardo Rossi, Marco Sebastiani, Warren Oliver, Herbert Pöllmann, Rodney Ewing |
On-Site Speaker (Planned) |
Tobias Beirau |
Abstract Scope |
Nanoindentation micro-pillar splitting and high-resolution mechanical properties mapping were employed to measure the fracture toughness (Kc) and to probe the indentation hardness (H) and elastic modulus (E), respectively, of growth zones in radiation-damaged zircon (ZrSiO4) with varying degree of disorder (~45-80% amorphous fraction). The radiation-induced amorphization is caused by α-decay events from incorporated U and Th (~3.7x - 7.5x10^18 α-decays/g). While E and H have found to decrease, Kc increases with the increase in amorphous fraction. As zircon has been proposed as a nuclear waste form for the incorporation of plutonium, a deeper knowledge of the mechanical behavior with increasing structural damage is important, as, e.g., radiation-induced cracking provides diffusion paths for the release of incorporated actinides. Zoned zircon provides a model for the development of multilayer coatings and complex ceramics that can be designed to be resistant to crack propagation and are used in high radiation fields. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Characterization, |