About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
Migration kinetics of twinning disconnections in nanotwinned Cu: an in situ HRTEM deformation study |
Author(s) |
Quan Li, Jian Song, GuiSen Liu, Yue Liu, XiaoQin Zeng |
On-Site Speaker (Planned) |
Quan Li |
Abstract Scope |
Growth or annealing twins normally form rectangular shape with abundant incoherent twin boundaries (ITBs), while deformation twins exhibit lenticular shape that composed of serrated coherent twin boundaries (SCTBs). Using in situ high-resolution TEM deformation technique, here we report the formation-mechanism differences between 1-layer or 2-layer serration/facet and {112} ITBs. The atomic resolution microscopy results of nanotwinned Cu manifested the 1-layer and 2-layer serration/facet formation on CTBs by interaction of mixed partial dislocations, via migration of twinning disconnections (TDs) along shearing direction. In comparison, periodic 3-layered TDs or ITBs structure were normally formed by annealing or growth process introduced spontaneous directionless partial dislocations. |
Proceedings Inclusion? |
Planned: |