Kari Ullakko

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The newest MFG4.0 dissertation reveals the potential of additive manufacturing for facilitating the development of magnetic shape memory alloy actuators

The newest MFG4.0 dissertation reveals the potential of additive manufacturing for facilitating the development of magnetic shape memory alloy actuators

MSc Ville Laitinen will defend his dissertation in the field of Technical Physics at LUT University. His doctoral thesis is titled Laser powder bed fusion for the manufacture of Ni-Mn-Ga magnetic shape memory alloy actuators.

It consists of a series of experimental investigations:  a laser powder bed fusion (L-PBF) additive manufacturing process and a subsequent heat-treatment process were developed for the manufacture of functional polycrystalline Ni-Mn-Ga-based magnetic shape memory (MSM) alloy.

 

Ville Laitinen

Junior Researcher,
LUT University

Image: Laitinen, V., Saren, A., Sozinov, A. and Ullakko, K., 2021. Giant 5.8% magnetic-field-induced strain in additive manufactured Ni-Mn-Ga magnetic shape memory alloy. Scripta Materialia, 208, p.114324.

The findings demonstrate that the chemical composition and resulting MSM-related properties of the L-PBF-built Ni-Mn-Ga can be precisely changed in-situ by adjusting the applied L-PBF process parameters to control the selective evaporation of Mn. A repeatable and fully reversible magnetic-field-induced strain of 5.8% is demonstrated for a single crystalline grain of an L-PBF-built Ni-Mn-Ga.

Practically, the reported results will permit the exploration of polycrystalline-MSM-based devices with a geometric freedom that has thus far been impossible with conventional manufacturing methods.

The results suggest that additive manufacturing can facilitate miniaturization and simplification of electromechanical devices in which traditional mechanisms and piezoelectric materials are impractical.

 

The dissertation will take place  at LUT University on 3rd of December 2021 at 12pm(UTC+2).

The dissertation will take place  at LUT University on 3rd of December 2021 at 12pm(UTC+2).

Opponents:
Professor Inigo Flores Ituarte Tampere University
Professor Ilkka Tittonen Aalto University

Custos:
Professor Kari Ullakko of LUT University

Keywords

additive manufacturing, 4D printing, laser powder bed fusion, Ni-Mn-Ga, magnetic shape memory, magnetic-field-induced strain, twinning

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