About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
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Presentation Title |
G-9: Micro-mechanical Characterization on Amorphous Carbon and its Nanoporous Structures |
Author(s) |
Zhongyuan Li, Ayush Bhardwaj, James Watkins, Seok-Woo Lee |
On-Site Speaker (Planned) |
Zhongyuan Li |
Abstract Scope |
Carbon materials have a strong potential as structural materials due to their strong ionic/covalent C-C bonds. In this study, we have developed amorphous carbon and its nanoporous structures with 50~70% of porosity and have investigated their mechanical behaviors. Both fully dense and nanoporous structures exhibit a large compressive fracture strain up to ~35% with a high work hardening rate. Raman spectroscopy revealed that the plasticity results from dynamic re-distribution of sp2 and sp3 bonds. Interestingly, fracture strength was found to be nearly independent of porosity. This porosity-independent fracture strength could result from the size-affected strength of nanoscale ligands. All amorphous carbon samples demonstrate the excellent modulus of resilience the orders of magnitude higher than most engineering materials, implying a strong capability to absorb and release the mechanical energy. Our study provides an insight into understanding of mechanical behavior of amorphous carbon and its nanoporous structure. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Phase Transformations, |