| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
|
| Presentation Title |
Binder Jet Printing and Sintering of Ni-Mn-Ga Magnetic Shape Memory Alloy Foams with Increased Porosity Through Powder Space-Holders |
| Author(s) |
Pierangeli Rodriguez de Vecchis, Markus Chmielus |
| On-Site Speaker (Planned) |
Markus Chmielus |
| Abstract Scope |
Ni-Mn-Ga magnetic shape memory alloys (MSMAs) exhibit a maximum magnetic field-induced strain (MFIS) of 6-11% in single crystalline form. In polycrystalline form MFIS is usually below 1% due to the restriction of twin boundary movement – the mechanism of large MFIS – at grain boundaries. By removing grain boundaries via pores, Ni-Mn-Ga foams produced MFIS close to single crystals. Using Binder Jet Printing (BJP) porosity can be controlled through the part design, layering defects, and partial sintering with the maximum porosity dictated by the green density (>50%). Introducing polymeric space-holders to the metal powder feedstock allows to pack the powder during printing while retaining higher porosity after space-holder burnt-out during sintering or post-dissolution. In this study, different space-holders were added to Ni-Mn-Ga MSMA feedstock to create foam parts through BJP. The effect of different space-holders on porosity, pore size distribution, and chemical homogeneity were investigated. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Magnetic Materials, Powder Materials |