Characterization of Gas Atomized Ni-Mn-Ga Powders

F. Nilsén (Corresponding Author), I. Aaltio, Y. Ge, Tomi Lindroos, S.P. Hannula

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    Abstract

    Gas atomization is a well-known process for obtaining high quality metallic powders. It produces spherical high-density particles with a controllable particle size distribution. We used gas atomization to obtain two different Ni-Mn-Ga powders and investigated their microstructure, transformation temperatures and magnetic properties as well as the effects of heat treatment on those. The phase and magnetic transformation temperatures of the powders were considerably lower as compared to similar conventionally prepared alloys. Nevertheless, heat treatment of the atomized powder was found to recover the magnetic properties of the materials, probably by releasing the residual strains generated by the rapid solidification during the gas atomization process. Sintering of powders seemed to start at a significantly lower temperature when compared to the powder prepared by ball milling of bulk Ni-Mn-Ga-alloys.
    Original languageEnglish
    Pages (from-to)S879-S882
    JournalMaterials Today: Proceedings
    Volume2
    Issue numberSupplement 3
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed
    EventInternational Conference on Martensitic Transformations, ICOMAT 2014 - Bilbao, Spain
    Duration: 6 Jul 201411 Jul 2014

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    Keywords

    • Ni-Mn-Ga
    • gas atomization
    • magnetic properties
    • microsturcture
    • ProperPart

    Cite this

    Nilsén, F., Aaltio, I., Ge, Y., Lindroos, T., & Hannula, S. P. (2015). Characterization of Gas Atomized Ni-Mn-Ga Powders. Materials Today: Proceedings, 2(Supplement 3), S879-S882. https://doi.org/10.1016/j.matpr.2015.07.422