| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloy Behavior and Design Across Length-Scales: An SMD Symposium Honoring Easo George
|
| Presentation Title |
Factors Affecting Mechanical Twinning in Single-phase FCC and Polycrystalline MEAs and HEAs |
| Author(s) |
Guillaume Laplanche |
| On-Site Speaker (Planned) |
Guillaume Laplanche |
| Abstract Scope |
In this study, recent progress will be presented in understanding the factors influencing the uniaxial stress above which mechanical twins are observed in medium- and high-entropy alloys (MEAs/HEAs) from the Cr-Mn-Fe-Co-Ni system. Efforts were made to produce alloys that are single-phase face-centered cubic (FCC), chemically homogeneous and have well-controlled grain sizes. Tensile tests at 293 and 77 K were interrupted at different strains and systematically characterized by transmission electron microscopy. The uniaxial twinning stress was found to be temperature independent and to increase with decreasing grain size. When the twinning stress is extrapolated to infinite grain size, it increases linearly with the intrinsic stacking fault energy. The results obtained in the present study will be compared to those of experimental and theoretical studies focusing on single crystals. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Phase Transformations |