About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Interactions between Dislocations and a Low-angle Grain Boundary in a Single Crystalline CrCoNi Medium-entropy Alloy |
Author(s) |
Frederic Habiyaremye, Antoine Antoine Guitton, Florian Schafer, Felicitas Scholz, Mike Schneider, Jan Frenzel, Guillaume Laplanche, Nabila Maloufi |
On-Site Speaker (Planned) |
Frederic Habiyaremye |
Abstract Scope |
This work investigates interactions of deformation-induced dislocations with a low-angle grain boundary (LAGB) in a single-crystalline CrCoNi medium entropy alloy. Microstructures before and after ľN-nanoindentation were examined using accurate electron channeling contrast imaging. Initially, the microstructure consists of subgrains separated by LAGBs. After nanoindentation on the (001) plane in the vicinity of a LAGB with a misorientation angle of 0.24°, deformation-induced dislocations formed pile-ups on {111} planes. These well-oriented pile-ups of dislocations were found to be blocked by the LAGB. Even though pile-ups interacted with the LAGB and that the extension of the pile-ups was constrained by the LAGB, micromechanical behaviors were similar to that observed when nanoindentation tests were performed far away from the LAGB. The LAGB is, therefore, a strong obstacle to dislocation motion and we point out areas for future research using nanoindentation in combination with advanced characterization methods to study the interaction between dislocations and LAGBs. |
Proceedings Inclusion? |
Planned: |