| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
|
| Presentation Title |
In-situ TEM Investigation of the Electroplasticity Phenomenon in Metals |
| Author(s) |
Xiaoqing Li, John Turner, Karen Bustillo, Rohan Dhall, Andrew M. 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 Nickel dog-bone shaped samples on electrical push-to-pull device were performed in order to correlate direct observations of nanostructure change with both mechanical data and applied electrical pulses in an effort to provide clarity on the true origin of this phenomenon. By analyzing the frame-by-frame videos with collected mechanical and electrical data, we found that deformation mechanisms and dislocation behaviors were changed during the pulsing period. Relatively large slip traces with dislocations nucleated from the edges could be triggered by the pulses, and dislocations tend to move with a faster speed and a longer distance compared to the purely mechanically-triggered movement. Results such as local joule heating which was measured indirectly through lattice expansion by diffraction will also be discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |