Effects of 1 at.% additions of Co, Fe, Cu, and Cr on the properties of Ni-Mn-Ga-based magnetic shape memory alloys

Namvari, Mahsa; Laitinen, Ville; Sozinov, A.; Saren, Andrey; Ullakko, K.

doi:10.1016/j.scriptamat.2022.115116

Scripta Materialia

2023

DOI: 10.1016/j.scriptamat.2022.115116

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Effects of 1 at.% additions of Co, Fe, Cu, and Cr on the properties of Ni-Mn-Ga-based magnetic shape memory alloys

Mahsa Namvari¹,

Ville Laitinen²,

A. Sozinov³

et al.

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Cited by 9 publications

References 44 publications

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In-situ alloying laser powder bed fusion of Ni-Mn-Ga magnetic shape memory alloy using liquid Ga

Milleret,

Laitinen,

Ullakko

et al. 2024

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Ni-Mn-Ga-based magnetic shape memory alloys can exhibit large magnetic field induced strains (MFIS). Recently, additive manufacturing techniques, especially laser powder bed fusion (L-PBF), have been successfully used to manufacture functional polycrystalline Ni-Mn-Ga with complex geometries, such as ‘bamboo-grained’ lattice structures. However, previous approaches of L-PBF of Ni-Mn-Ga have used pre-alloyed powders, which can limit the compositional freedom of the manufactured devices. This study explores, for the first time, the feasibility of an in-situ L-PBF alloying approach using a powder blend of elemental Ni, Mn, and Ga. Promising results were obtained despite the significant differences between the elemental Ni and Mn powders and the liquid Ga. The microstructure of the as-built sample showed distinct stripe patterns from the 14 M structure confirmed by XRD analysis. Heat-treatment significantly improved chemical homogeneity, dissolved the Ni-rich phase but couldn’t dissolve MnO hindering the shape memory effect.

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In-situ alloying laser powder bed fusion of Ni-Mn-Ga magnetic shape memory alloy using liquid Ga

Milleret,

Laitinen,

Ullakko

et al. 2024

Prog Addit Manuf

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Structure-property control of polycrystalline Ni-Mn-Ga by moderate Co-doping

Namvari

Chernenko

Saren

et al. 2023

Journal of Alloys and Compounds

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Effect of moderate Fe doping and heat treatment on the microstructure of Ni-Mn-Ga melt-spun ribbons

Namvari,

Rosero-Romo,

Laitinen

et al. 2023

Journal of Alloys and Compounds

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Effects of 1 at.% additions of Co, Fe, Cu, and Cr on the properties of Ni-Mn-Ga-based magnetic shape memory alloys

Cited by 9 publications

References 44 publications

In-situ alloying laser powder bed fusion of Ni-Mn-Ga magnetic shape memory alloy using liquid Ga

In-situ alloying laser powder bed fusion of Ni-Mn-Ga magnetic shape memory alloy using liquid Ga

Structure-property control of polycrystalline Ni-Mn-Ga by moderate Co-doping

Effect of moderate Fe doping and heat treatment on the microstructure of Ni-Mn-Ga melt-spun ribbons

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