| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
|
| Presentation Title |
Powder-Blown Laser-Based Directed Energy Deposition of Ni-Mn-Ga Magnetic Shape Memory Alloy |
| Author(s) |
Ville Laitinen, Anastassia Milleret, Mahsa Namvari, Pierangeli Rodriguez De Vecchis, Moataz Attallah, Markus Chmielus, Kari Ullakko |
| On-Site Speaker (Planned) |
Ville Laitinen |
| Abstract Scope |
Ni-Mn-Ga-based magnetic shape memory alloys are renowned for their large magnetic-field-induced strains, making them attractive for compact magnetically controlled actuators requiring high response frequencies and large reversible deformations. This study explores the additive manufacturing of Ni-Mn-Ga alloy samples using powder-blown laser-based directed energy deposition (DED-LB). The samples were deposited following a systematic experimental design, varying the applied laser power and employing two melting strategies: unidirectional and bidirectional. The study demonstrates that DED-LB can produce high-density Ni-Mn-Ga samples with predictable Mn loss compared to the powder feedstock. Both as-deposited and heat-treated samples exhibited modulated martensite structures at ambient temperature. The heat-treated samples also showed reversible martensite transformations, Curie temperatures, and saturation magnetizations corresponding to their chemical compositions. The melting strategy influenced the microstructure, with bidirectional melting creating large columnar grains with a strong <100> texture along the build direction. This research underscores the potential of DED-LB in manufacturing functional Ni-Mn-Ga actuators. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Magnetic Materials |