About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Multiscale and Non-Equilibrium Solidification Fundamentals
|
| Presentation Title |
Solidification dynamics guided grain engineering for laser additive manufacturing of high-entropy alloys |
| Author(s) |
Lianghua Xiong, Anping Dong, Baode Sun |
| On-Site Speaker (Planned) |
Lianghua Xiong |
| Abstract Scope |
Precise control of grain structure evolution during the rapid, non-equilibrium solidification inherent to laser additive manufacturing (LAM) of high-entropy alloys (HEAs) is crucial for achieving target mechanical properties, yet remains a significant challenge. This study utilizes high-speed synchrotron X-ray imaging and diffraction to directly probe and quantify dynamic solidification phenomena – including melt pool flow, dendrite growth kinetics, fragmentation events, and columnar-to-equiaxed transitions within the melt pool of a model HEA during LAM. By establishing quantitative correlations between these real-time, transient melt-pool dynamics and post-process, multiscale characterization (EBSD, XCT), we elucidate the causal link between solidification conditions and final grain morphology. This in-situ observation-guided strategy successfully achieves spatially tailored grain structures within HEA components, significantly enhancing strength-ductility synergy. These results provide fundamental insights into non-equilibrium solidification pathways and establish a validated, dynamics-based framework for predictive grain structure control in LAM of compositionally complex alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Solidification, Additive Manufacturing |