About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Mechanical Behavior at the Nanoscale VII
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Presentation Title |
Electropulsing Induced Microstructural Changes and Electroplasticity in Metallic Materials |
Author(s) |
Jiangwei Wang, Xing Li, Youran Hong |
On-Site Speaker (Planned) |
Jiangwei Wang |
Abstract Scope |
This talk will present the defect dynamics and physical origin of eletroplasticity in metallic materials. By using the in situ TEM electropulsing experiment with nanosecond pulse, the electron wind force can be largely eliminated. Upon electropulsing, a non-directional migration of Σ3{112} incoherent twin boundary was captured, in contrast to the expected directional migration under electron wind force. This exceptional incoherent twin boundary migration is governed by the electron-dislocation interaction that enhances the atom vibration at dislocation cores, rather than driven by the electron wind force in classic model. We further demonstrate that the electron-defect interaction can be used to tailor the structural heterogeneity of metallic glasses, which induce a brittle-to-ductile transition in Ta metallic glasses. By studying the Ta metallic glasses with different structural heterogeneities, the relation between deformability and medium-range order in metallic glasses is established. These findings provide valuable insights into the origin of electroplasticity in metallic materials. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Characterization, Modeling and Simulation |