About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Feedstock Processing for Multifunctional Materials
|
| Presentation Title |
Binder Jet Printing and Sintering of Ni-Mn-Ga Magnetic Shape Memory Alloy Foams Through the Powder Space-Holder Technique |
| Author(s) |
Markus Chmielus, Pierangeli Rodriguez De Vecchis |
| On-Site Speaker (Planned) |
Markus Chmielus |
| Abstract Scope |
Polycrystalline Magnetic Shape Memory Alloys (MSMAs) show negligible functionality (magnetic field-induced strain, MFIS) compared to single crystalline material, due to the added grain boundary constraints that impede twin boundary motion. Addition of porosity to create metal foams has proven effective to increase MFIS by reducing grain-to-grain boundary density. However, Ni-Mn-Ga foam manufacturing is generally restricted in geometry by the replication cast approach. In this study, manufacturing of porous Ni-Mn-Ga MSMAs was investigated through Binder Jet Printing (BJP) and sintering. Porosity beyond the powder packing fraction was achieved through different space-holder additions to the powder feedstock (sodium aluminate, sodium chloride, and poly-methyl methacrylate). Their influence on the sintering behavior post-burnout and dissolution was measured by remanent porosity fraction and connectivity, shape retention, and composition. Furthermore, the effect of low-field magnetic alignment, mimicking the effect of directional solidification to introduce texture, was also investigated through orientation-dependent magnetic measurements to quantify anisotropy. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Powder Materials, Additive Manufacturing |