About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Multiscale and Non-Equilibrium Solidification Fundamentals
|
| Presentation Title |
CALPHAD-guided in situ dilution for additive manufacturing of a non-printable Ni-based superalloy |
| Author(s) |
Xipeng Tan |
| On-Site Speaker (Planned) |
Xipeng Tan |
| Abstract Scope |
Fine-tuned compositional redesign for rapid solidification remains a critical challenge in additive manufacturing (AM) of high-performance engineering alloys, particularly in mitigating crack formation. In this study, we investigate a first-generation single-crystal Ni-based superalloy, which is known for its poor printability, and implement an in situ dilution strategy to address severe cracking in laser directed energy deposition (L-DED). By integrating CALPHAD-based solidification modeling with high-throughput AM experiments, we uncover key multiscale and non-equilibrium solidification mechanisms that govern defect formation and microstructural evolution. The optimized alloy design leverages a favorable solidification path, enhanced liquid feeding, and reduced shrinkage-induced strain while tuning the γ′ precipitation driving force to align with the non-equilibrium solidification window. These multiscale interactions between thermal gradients, solidification dynamics, and nanoscale phase stability contribute to significant defect mitigation and mechanical robustness at elevated temperatures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Solidification |