About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VIII
|
| Presentation Title |
Giant Superelasticity at the Nanoscale in Cu-Al-based Shape Memory Alloys associated with a Double Martensitic Transformation |
| Author(s) |
Jose M. San Juan, José F. Gómez-Cortés, Maria L. Nó |
| On-Site Speaker (Planned) |
Jose M. San Juan |
| Abstract Scope |
In-situ nano tensile experiments inside the scanning electron microscope allows showing that micro/nano features of Cu-Al-Ni and Cu-Al-Be alloys exhibit a giant superelastic behavior with recoverable strains up to 28%, which largely exceeds the present knowledge at the nanoscale. Samples with a cross-section under 0.4 μm2 undergo a reproducible two-stage stress-induced MT. The cubic β austenite, transforms into two monoclinic martensites through two atomic lattice shearing events, to β’ martensite first, and then to α’ martensite. In addition, this giant superelasticity can withstand stresses as high as 1 GPa without failure, offering an ultra-high mechanical damping capacity with a loss factor of η=0.2 and an exceptionally high work-output density of 78 MJ/m3 for actuation. The discovery of this giant superelasticity, opens the door to designing unforeseen flexible and stretchable microsystems as well as 3D architected nano devices. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Nanotechnology, Phase Transformations |