About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
D-24: Tailoring Shape Memory Effect (SME) Performance of Fe-Mn-Si SMAs via VC Precipitation |
| Author(s) |
Jane Yun, Ji Young Kim, Eun Soo Park |
| On-Site Speaker (Planned) |
Jane Yun |
| Abstract Scope |
With increasing attention on Fe-based SMAs for seismic damping in civil infrastructure, achieving large and stable recovery stress is critical for effective prestressing in concrete columns. While VC precipitates are known to enhance recovery stress via matrix strengthening, this study reveals that their size distribution and spatial arrangement influence the shape memory effect (SME) feature as well. VC Precipitate behavior was characterized using in-situ SAXS and synchrotron X-ray diffraction, confirming 6–30 nm carbides formation along grain boundaries and within the matrix. Interestingly, TEM analysis revealed that stacking faults develop alongside carbide precipitation, as Shockley partial dislocations accumulate near precipitates due to lattice mismatch. VC precipitation, due to increased stacking faults, thus contributes not only to precipitation hardening but also to the enhancement of reversible martensitic transformation. This study establishes a direct correlation between nanoscale precipitate structures and macroscopic SME performance, providing a basis for microstructural optimization of Fe-based SMAs. |
| Proceedings Inclusion? |
Planned: |