A1 Journal article (refereed), original research (Journal article, original research)

Giant 5.8% magnetic-field-induced strain in additive manufactured Ni-Mn-Ga magnetic shape memory alloy


Open Access hybrid publication


Publication Details

Authors: Laitinen Ville, Saren Andrey, Sozinov Alexei, Ullakko Kari

Publisher: Elsevier

Publication year: 2021

Language: English

Related journal or series: Scripta Materialia

Volume number: 208

ISSN: 1359-6462

eISSN: 1872-8456

JUFO level of this publication: 3

Digital Object Identifier (DOI): http://dx.doi.org/10.1016/j.scriptamat.2021.114324

Permanent website address: https://www.sciencedirect.com/science/article/pii/S1359646221006047?via%3Dihub

Open Access: Open Access hybrid publication


Abstract

Laser powder bed fusion (L-PBF) additive manufacturing process was employed to manufacture polycrystalline Ni-Mn-Ga samples. The samples were heat-treated for chemical homogenization and grain growth. It is demonstrated that the chemical composition, resulting martensitic crystal structures, and phase transformation temperatures of the L-PBF-built Ni-Mn-Ga can be precisely changed in-situ by controlling the selective evaporation of Mn through adjusting the process parameters. Subsequently, repeatable and fully reversible magnetic-field-induced strain of 5.8% was measured in a single crystalline grain of an additive manufactured polycrystalline Ni-Mn-Ga sample exhibiting a 10M martensitic structure at ambient temperature. The results indicate that L-PBF can be used to manufacture Ni-Mn-Ga devices containing active parts that can be strained by an external magnetic field.


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Last updated on 2021-08-12 at 12:24