Giant 5.8% magnetic-field-induced strain in additive manufactured Ni-Mn-Ga magnetic shape memory alloy. (1st February 2022)

• Record Type: Journal Article
• Authors: Laitinen, Ville; Saren, Andrey; Sozinov, Alexei; Ullakko, Kari
• Is Part Of: Scripta materialia. Number 208(2022)
• Publication Date: 2022-02-01
• Subjects: Additive manufacturing -- Laser powder bed fusion -- Ferromagnetic shape memory -- Twinning -- Ni-Mn-Ga; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114324
• Languages: English
• ISSNs: 1359-6462

Abstract

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. Graphical abstract: Image, graphical abstract