About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Aluminum Alloys, Characterization and Processing
|
Presentation Title |
The Role of Ti and B Additions in Grain Refinement of Al-Mn Alloy during Laser Additive Manufacturing |
Author(s) |
Qingyu Pan, Monica Kapoor, Sean Mileski, John Carsley, Xiaoyuan Lou |
On-Site Speaker (Planned) |
Qingyu Pan |
Abstract Scope |
While adding Ti and B to Al alloys is the proven method for grain refinement, the actual mechanism is still under debate. In the present work, we investigated the governing mechanism of Ti and B additions to grain refinement in AA3104 Al-Mn alloy during laser direct energy deposition (DED) additive manufacturing (AM). The microstructure development and phase transformation of DED AM AA3104 were studied after adding different fractions of Ti, B, Ti-B mixture, and TiB2 particles. The transition from large columnar grains to fine equiaxed grains was observed after Ti and Ti-B addition, but not after B and TiB2 addition. The high fraction of alloy additions were required to develop effective grain refinement. The roles of intermediate species Al3Ti and TiB2 particles during laser solidification were characterized by synchrotron X-ray, SEM, and optical image analysis.Al3Ti was confirmed to play a dominating role in grain nucleation during DED AM. |
Proceedings Inclusion? |
Planned: Light Metals |
Keywords |
Aluminum, Additive Manufacturing, Phase Transformations |