| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
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| Presentation Title |
Insights Towards the Grain Refinement of Al-Mn-Fe-Si Alloy via In Situ Reaction During Laser Direct Energy Deposition |
| Author(s) |
Qingyu Pan, Fan Zhang, Deepak Vikraman Pillai, Zilong Zhang, Yufeng Zheng, Lang Yuan, Monica Kapoor, John Carsley, Xiaoyuan Lou |
| On-Site Speaker (Planned) |
Qingyu Pan |
| Abstract Scope |
The actual mechanism of grain refinement of Aluminum alloys in additive manufacturing (AM) is still under debate. In the present work, we investigated the governing mechanism of grain refinement by adding insitu reactants, pure titanium (Ti) or a combination of Ti and boron (B), and exsitu TiB2 particles in Al-Mn-Fe-Si alloy during laser direct energy deposition (DED). The transition from large columnar grains to refined equiaxed grains was achieved by insitu reactants. The sole addition of Ti was identified as the best grain refiner in this study while B addition would diminish grain refinement, due to the consumption of Ti to form TiB2. The study confirmed the more effective role of insitu formed D022-Al3Ti, which served as nucleation sites, in grain nucleation. However, insitu formed TiB2 mainly showed grain boundary pinning effect. The study also confirmed that the substrate heating further improved grain refinement. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Aluminum, Solidification |