About this Abstract |
Meeting |
2021 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 |
In-situ TEM Investigation of the Electroplasticity Phenomenon in Ti-6Al |
Author(s) |
Xiaoqing Li, Shiteng Zhao, John Turner, Karen Bustillo, Rohan Dhall, Andrew Minor |
On-Site Speaker (Planned) |
Xiaoqing Li |
Abstract Scope |
Electroplasticity is a phenomenon in which applied pulsed electric fields during deformation result in reduced flow stress and increased formability in metals. In this work, in situ TEM electromechanical tests of Ti-6Al tensile samples on electrical push-to-pull devices were performed in order to correlate direct observations of nanostructure change with both mechanical data and applied electrical. By analyzing the frame-by-frame videos with the recorded mechanical and electrical data, we can compare the deformation mechanisms and dislocation behaviors during the pulsing period. We found, upon applying electrical current, many slip directions in the HCP system are activated and dislocation nucleation is less concentrated spatially, which indicating the effect of electrical current can make the plastic deformation on the metal piece more uniform. More theoretical analysis about the short-range order rearrangement by applied electrical current and local lattice expansion measurement will be discussed to evaluate Joule heating effect from electron wind effect. |
Proceedings Inclusion? |
Planned: |