Towards the additive manufacturing of Ni-Mn-Ga complex devices with magnetic field induced strain

0565341 - FZÚ 2023 RIV NL eng J - Journal Article
Ituarte, I.F. - Nilsén, Frans - Nadimpalli, V.K. - Salmi, M. - Lehtonen, J. - Hannula, S.-P.
Towards the additive manufacturing of Ni-Mn-Ga complex devices with magnetic field induced strain.
Additive Manufacturing. Roč. 49, Jan (2022), č. článku 102485. ISSN 2214-8604. E-ISSN 2214-7810
R&D Projects: GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : additive manufacturing * smart materials * magnetic shape-memory alloys * 4D printing * MFIS
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 11, year: 2022
Method of publishing: Open access

Laser powder bed fusion (L-PBF) is used to produce foam-like Ni-Mn-Ga with tailored microscale and mesoscale features. Ni50-Mn28.2-Ga21.8 (at%) powder was gas atomised and processed in an L-PBF system with a range of energy density from 26.24 and 44.90 J/mm3. We characterised microscale and mesoscale properties, such as the chemical composition, crystal structure, magnetisation measurements, density, and porosity measurements as a function of process parameters, in a systematic design of experiment. Preliminary research on macroscale properties included tensile testing and magnetic field induced strain (MFIS) measurements. Results show how controlling process parameters allows tailoring the Ni-Mn-Ga polycrystalline microstructure. Hence, obtaining twinned martensitic structures with a predominant orientation going across the visible grain boundaries. All the processed samples showed a 56 Am2/kg magnetisation level, close to Ni-Mn-Ga 10 M single crystals.
Permanent Link: https://hdl.handle.net/11104/0336890