About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Engineering Ductility in Cr-Alloys via Duplex Microstructures and Solute Design |
| Author(s) |
Bryan Lim, Jeffrey M. Brookins, Christopher M. Fancher, Peeyush Nandwana |
| On-Site Speaker (Planned) |
Bryan Lim |
| Abstract Scope |
Cr-based alloys offer strong potential as high-temperature, corrosion-resistant materials, yet their adoption is limited by room-temperature brittleness due to their BCC matrix. We address this by demonstrating a duplex Cr-Ni alloy with solute additions that achieves room-temperature tensile plasticity. First, Ni additions create a FCC phase, enabling strain partitioning into a more compliant lattice within a duplex BCC/FCC microstructure. Second, solute additions enhance the cohesive strength of grain and phase boundaries while gettering impurities. Arc-melt trials and tensile tests across successive alloy generations confirm that this strategy yields a stable duplex microstructure with room-temperature ductility and modest strength loss at 760 °C. Multi-length-scale characterization links these properties to hierarchical microstructures in three compositions: (i) a base Cr–Ni binary, (ii) a binary variant with increased FCC content, and (iii) the same FCC-rich variant further modified by solute additions. The results offer a practical framework for designing ductile, corrosion-resistant Cr–Ni alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Characterization, Mechanical Properties |