| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
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| Presentation Title |
In Situ Synchrotron Imaging of Ni-Mn-Ga During Laser Powder Bed Fusion |
| Author(s) |
Anastassia Milleret, Samy Hocine, Kwan Kim, Ville Laitinen, Alexander Rack, Peter D. Lee, Chu Lun Alex Leung |
| On-Site Speaker (Planned) |
Anastassia Milleret |
| Abstract Scope |
Single crystals of Ni-Mn-Ga magnetic shape memory alloys can deform up to 12% under a magnetic field via twin boundary motion (TBM), making them suitable for ultrafast actuators. However, in polycrystals, grain boundaries hinder TBM, reducing their functionality. Recent studies explored the printability of Ni-Mn-Ga polycrystals using laser powder bed fusion (LPBF) via two approaches: creating foam-like samples through process tunning, or designing lattice structures with engineered porosity. Although previous studies have shown success in LPBF of Ni-Mn-Ga, the samples often exhibit internal defects (cracks and porosity) limiting their functionality. Here, we performed in situ x-ray imaging at ESRF ID19 to investigate the influence of LPBF process parameters on defect formation and cracking susceptibility, aiming to produce defect-free lattice struts or foam-like structures. Significant differences between process conditions were observed, with a clear transition between keyhole mode and conduction mode, while the cracking susceptibility appeared more unpredictable. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Magnetic Materials, Shaping and Forming |