| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Applications of Solidification Fundamentals
|
| Presentation Title |
Continuity of Eutectic Microstructures Across Melt Pool Boundaries in Laser Powder Bed Fusion |
| Author(s) |
Jonathan M. Skelton, James Fitz-Gerald, Jerrold Floro |
| On-Site Speaker (Planned) |
Jonathan M. Skelton |
| Abstract Scope |
In alloys processed by laser powder bed fusion (LPBF), grains often grow epitaxially between each sequentially melted layer. However, little research has focused on whether extended two-phase microstructures, such as those found in eutectic systems, retain spatial and crystallographic registry across melt pool boundaries. In this research, LBPF is being used to form multi-layer single track samples of the Al-Cu eutectic system. Focused ion beam-based tomography and electron backscatter diffraction will be used to evaluate the local continuity of the FCC and Al2Cu phases in these samples, and their orientation relationship, across the melt pool boundary. Although coarsening of the lamellar microstructure occurs at the layer boundaries due to secondary heating, epitaxial growth may still occur if the initial rate of solidification in the melt pool exceeds the rate of coarsening in the previous layer. Support of the NSF under grant DMR-1663085 is gratefully acknowledged. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Solidification, |