About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Dislocation-Guided Precipitation and Strengthening in Direct-Aged LPBF Cu-30Ni-1Nb Alloy |
| Author(s) |
Debasis Rath, Markus Chmielus, Zachary D. Harris |
| On-Site Speaker (Planned) |
Debasis Rath |
| Abstract Scope |
This study explores the effect of direct aging on the spatial distribution of precipitates and dislocation behavior in LPBF Cu-30Ni-1Nb alloy. Transmission electron microscopy (TEM) reveals dislocation cell structures in the as-built condition, which promote the preferred formation of Ni3Nb precipitates along the cell walls and precipitate-free zones (PFZs) after aging. Interrupted tensile testing captures interactions between dislocations, dislocation cell walls, aligned precipitates, and PFZs. Precipitation kinetics and transformation pathways are examined using differential scanning calorimetry (DSC), TEM and Thermo-Calc simulations. Geometrically necessary dislocation mapping and precipitate volume fraction analysis are used to assess microstructural evolution during deformation. The results provide insight into dislocation-guided precipitation mechanisms and the role of LPBF-specific microstructures in influencing phase stability and plastic deformation behavior. Furthermore, this mechanistic understanding is crucial for designing optimized heat treatments that harness the unique precipitation pathways of LPBF Cu-Ni alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Phase Transformations |