About this Abstract |
Meeting |
2023 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 |
Atomistic Perspective of Grain Boundary Plasticity in Metals |
Author(s) |
Qi Zhu, Haofei Zhou, Huajian Gao, Jiangwei Wang |
On-Site Speaker (Planned) |
Qi Zhu |
Abstract Scope |
Grain boundary (GB) as an indispensable defect sustaining the structural integrity and mass transport of materials can significantly contribute to the plastic deformation, and the theory of GB plasticity keeps advancing. Combining state-of-the-art in situ transmission electron microscopy nanomechanical testing and multi-scale simulations, the atomistic evolutions of GBs in metals under external loading can be unambiguously revealed. In essence, the nucleation, propagation and interactions of inherent disconnections leads to shear-coupled GB migration, which applies to the plasticity of GB networks. Besides, the structural evolution of GBs can coordinate with intragranular plasticity such as deformation twinning, thereby dynamically adjusting the mobility of GBs and tuning the mechanical responses of metallic materials. These findings consolidate a series of missing puzzles for developing the full map of GB-mediated deformation, furnishing our understanding of GB plasticity. This talk is based on our recent papers on Nature Communications (2021) and Science Advances (2022). |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, Modeling and Simulation |