About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
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Presentation Title |
Deformation Behavior of Plastic Amorphous Aluminum Oxide Thin Films |
Author(s) |
Nidhin George Mathews, Erkka J. Frankberg, Aloshious Lambai, Fabio Di Fonzo, Erkki Levänen, Gaurav Mohanty |
On-Site Speaker (Planned) |
Nidhin George Mathews |
Abstract Scope |
Amorphous oxides are promising candidates to different applications in modern electronics technology with potential use in dielectrics, optoelectronics, tuned semiconductors etc. Due to the inherent brittleness of these amorphous systems at bulk scale, their applications in many technological fields are not yet fully explored. Recently, Frankberg et al. (Science, 2019) reported that nanoscale thin films of amorphous aluminum oxides, made by pulsed laser deposition, exhibit significant unconfined plasticity at room temperature under all principal loading modes. Here, we present further insights to the plasticity and fracture of these thin films using micropillar compression and microcantilever bending experiments. Micropillar compression showed substantial plasticity whereby the pillars could be compressed to 50% total strain, without fracture, over large range of strain rates (0.001-1000/s). The rate controlling deformation mechanism(s) were studied using strain rate jumps tests. This study provides the possibility to enhance the plasticity in amorphous materials to become more damage tolerant. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Thin Films and Interfaces, Characterization |