| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
|
| Presentation Title |
Design of an Aluminum Alloy Based on Stable Nanoparticles for Achieving Uniformly Refined Grain Structure in Laser Metal Additive Manufacturing |
| Author(s) |
Minglei Qu, Qilin Guo, Ali Nabaa, Luis Izet Escano, Jiandong Yuan, Junye Huang, Qingyuan Li, Lianyi Chen |
| On-Site Speaker (Planned) |
Minglei Qu |
| Abstract Scope |
The microstructure in laser metal additive manufacturing (AM) often displays heterogeneity due to variations in solidification conditions across different melt pool positions. Here, we introduced TiC nanoparticles during laser AM of Al6061, and achieved a uniformly refined equiaxed grain structure at every location of the melt pool. To uncover the underlying mechanism, in-situ high-speed X-ray imaging and thermo-fluid dynamics simulation were employed to capture the dynamic evolution of the solidification rates and temperature gradients at different melt pool positions. These data were then evaluated using our newly developed columnar-to-equiaxed transition (CET) model. Results reveal that TiC-induced heterogeneous nucleation can facilitate CET only at the melt pool center. Further grain refinement at the melt pool boundary, characterized by a low solidification rate and a high temperature gradient, was achieved through particle-induced grain growth restriction. Our research provides material design guidelines for achieving uniformly refined grain structures in metal AM. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Aluminum, Solidification |