| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
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| Presentation Title |
Isothermal Oxidation of Ni-Mn-Ga Magnetic Shape Memory Alloys and Its Application to Sintering Atmosphere |
| Author(s) |
Pierangeli Rodriguez De Vecchis, Rafael Tomas Rodriguez De Vecchis, Brian Gleeson, Markus Chmielus |
| On-Site Speaker (Planned) |
Pierangeli Rodriguez De Vecchis |
| Abstract Scope |
Off-stoichiometric Ni2MnGa Magnetic Shape Memory Alloys (MSMAs) are commonly manufactured as single-crystals to allow for their maximum functionality (6-10% magnetic-field-induced strain, MFIS). However, recent publications have attempted to diversify part geometry through polycrystalline Additive Manufacturing (AM). AM techniques have focused on promoting texture (laser-based) or introducing porosity (sinter-based) to decrease the grain boundary area that reduces functionality. In particular, porous parts created through Binder Jet Printing (BJP) require a sintering heat treatment for particle bonding where the effect of atmosphere on oxidation and Mn evaporation is not well understood. In this study, the effect of sintering atmosphere (air, vacuum, Ni/NiO, Mn/MnO and carbon-containing) were studied at isothermal conditions on solid as-cast parts. The knowledge gained from oxide characterization and penetration depth was used to optimize the powder sintering process leading to particle bonding without surface oxidation and minimum Mn content loss that would inhibit functionality. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Powder Materials, Characterization |