| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VI
|
| Presentation Title |
Nano-mechanical Behavior Associated with Dislocation-boundary Interaction Characterized though Nanoindentation and TEM In-situ Straining |
| Author(s) |
Takahito Ohmura |
| On-Site Speaker (Planned) |
Takahito Ohmura |
| Abstract Scope |
Plastic deformation behavior in the vicinity of boundaries include grain boundary and inter-phase boundary in bcc steels are characterized through nano-mechanical testing and modeled based on a dislocation-boundary interaction. The resistance to a slip transfer at the grain boundary depends on the crystallographic orientation, and is interpreted in terms of the difference in the dislocation character. Dislocations in grain interior can sink at the grain boundary of ultra-fine-grained steel, indicating a dislocation density dominancy in the extra-hardening in the UFG steel. The critical stress for plasticity initiation is lower for a semi-coherent ferrite-cementite interface than that for an incoherent one, suggesting a potential reason for the dis- and continuous yielding phenomenon in macroscopic stress-strain curve. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Iron and Steel |