| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Defects and Interfaces: Modeling and Experiments
|
| Presentation Title |
D-25: In-situ Characterization of Martensitic Phase Transformation Interfaces in CuAlNi during Mechanical Cycling Using Dark Field X-ray Microscopy |
| Author(s) |
E. Celeste Perez-Valenzuela, Adam Abel Creuziger, Sangwon Lee, Evan Rust, Raquel Rodriguez Lamas, Albert Zelenika, Can Yildrim, Carsten Detlefs, Ashley Bucsek |
| On-Site Speaker (Planned) |
E. Celeste Perez-Valenzuela |
| Abstract Scope |
Reversible martensitic phase transformations (diffusionless solid-to-solid phase transitions) are the deformation mechanism behind the functional properties of many switchable multiferroic materials including shape memory alloys. During forward and reverse transformation, interfacial stress fields emerge at phase interfaces, leading to a hysteresis and the formation of dislocations that result in functional fatigue. Here, we employ dark-field X-ray microscopy (DFXM), a high-resolution diffraction microstructure imaging technique, to characterize these phase interfaces and interfacial stress fields during mechanical cycling in a CuAlNi shape memory alloy. The results show the 3D emergence and evolution of individual phase interfaces and spatially-mapped orientation and elastic strain, including the interfacial elastic strain fields at the phase interfaces. These findings will contribute to a better understanding of the origins of hysteresis and functional fatigue by investigating interfacial stress fields and dislocation generation at phase interfaces and their effects on macroscopic behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Phase Transformations, Computational Materials Science & Engineering |