About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2026 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-99: Tracking the Local Structure of Mn in Cu-Al-Mn Superelastic Alloys During Successive Stress-Induced Martensitic Transformations by In-Situ Micro-XAFS |
| Author(s) |
Zheyuan Liang, Kakeru Ninomiya, Hiroshi Akamine, Sumio Kise, Minoru Nishida, Maiko Nishibori |
| On-Site Speaker (Planned) |
Zheyuan Liang |
| Abstract Scope |
Cu-Al-Mn-based superelastic alloys are promising alternatives to Ni-Ti alloys for large-scale applications, such as seismic-resistant components, owing to their high workability, low temperature dependence and low-material cost, with their successive stress-induced martensitic transformations. (SSIMTs, L21→6M→2M). In this study, SSIMTs in single-crystal Cu-Al-Mn alloys were systematically investigated using in-situ micro-XAFS measurements under uniaxial tensile loading. Combined with spectral simulations, the evolution of the Mn local structure during MT process was quantitatively tracked.
Distinct differences in the local structure associated with the 6M martensitic phase were identified between the solution-treated and heat-treated states. Spectral simulations indicate that Mn atoms preferentially occupy 2O-type layers adjacent to the 6M modulation planes. Furthermore, heat treatment was found to induce L21 local characteristics within the 6M phase, accompanied by element-dependent local ordering. The increase in atomic ordering induced by heat treatment enhances structural stability, suggesting a clear correlation with the improvement in shape memory effects. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Phase Transformations, Modeling and Simulation, Characterization |