About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
Towards the Laser-based 4D Printing of Ni-Mn-Ga Magnetic Shape Memory Alloy Actuators |
Author(s) |
Ville Laitinen, Kari Ullakko |
On-Site Speaker (Planned) |
Ville Laitinen |
Abstract Scope |
Ni-Mn-Ga-based magnetic shape memory (MSM) alloys can exhibit large reversible magnetic-field-induced strains of ~6-12%, making them a promising actuation material for small devices in which traditional mechanisms and piezoelectric materials would be impractical. Recent investigations have demonstrated the feasibility of laser powder bed fusion (L-PBF) for the additive manufacturing of functional polycrystalline Ni-Mn-Ga that can, after the grain boundary constraints have been sufficiently reduced, develop up to 5.8% reversible magnetic-field-induced strain. Additionally, the chemical composition of L-PBF-built Ni-Mn-Ga can be precisely changed in situ by adjusting the L-PBF process parameters to control the selective evaporation of Mn, enabling the in situ control of the crystal structure and the resulting MSM-related properties. The reported results open new avenues for the explorative development of polycrystalline-based MSM devices with geometric freedom and locally (within the device itself) tailored functional properties. |