About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VIII
|
| Presentation Title |
High Strain Rate Deformation of Dewetted
B2-Iron Aluminide Intermetallic Microparticles
|
| Author(s) |
Dipali Sonawane, Lalith Kumar Bhaskar, Philipp Watermeyer, Bárbara Bellón, Dominique Chatain, Gerhard Dehm, Rajaprakash Ramachandramoorthy |
| On-Site Speaker (Planned) |
Rajaprakash Ramachandramoorthy |
| Abstract Scope |
The modification in the alloy design process is limited by the quick assessment of their strength at extreme service environments and cost-effective mass fabrication of test samples. As mitigation, we present a case study on B2-iron aluminide (FeAl) intermetallic, wherein a solid-state dewetting process is used to fabricate single-crystal microparticles from thin films. To mimic the extreme application-conditions, in situ micro-compression testing was performed using a piezo-based nanomechanical testing system at strain rates of 0.01-1000/s. The microparticles exhibited near ideal strength at all strain rates. The stress-strain curves showed characteristic dislocation nucleation based stress drop and exhibited negligible strain rate sensitivity with apparent activation volume in the nucleation regime (<1b^3). Furthermore, TEM analysis on compressed particles showed, for the first time, the deformation twins at all strain rates, substantiating that the deformation mechanism of pristine B2 FeAl also involves the nucleation and growth of twins along with dislocation interactions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, Other |