Determining the liquidus and ordering temperatures of the ternary Ni-Mn-Ga and quaternary Ni-Mn-Ga-Fe/Cu alloys

I. Aaltio*, Outi Söderberg, M. Friman, I. Glavatskyy, Y. Ge, N. Glavatska, S-P. Hannula

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    The high temperature transformations (e. g. liquidus, ordering temperature) of the alloys Ni47.7Mn31.2Ga21.1, Ni49.7Mn28.7Ga21.6, and Ni49.6Mn24.0Ga26.6, Ni47.3Mn30.3Ga20.3Fe2.1, Ni49.9Mn28.3Ga20.1Fe1.7, Ni51.3Mn14.4Ga26.3Fe8.0, Ni47.3Mn25.5Ga24.5Cu2.7, Ni48.3Mn29.7Ga21.1Cu0.9, and Ni49.4Mn23.3Ga25.6Cu1.7 were studied for the practical melting and annealing purposes. At first the chemical compositions (SEM-EDS) and the martensitic and magnetic transition temperatures (DSC, ac magnetic susceptibility) of the alloys were determined. High temperature DSC measurements were made in argon with 10 K/min. Two first measurements were carried out in the solid state (301-1273 K) and in the third measurement the material was melted (max meas. temp. 1573 K). The ordering temperature was obtained from the measurements in the solid state. As the e/a ratio was above 7.53 the ordering temperature was in the range of 1019-1039 K, otherwise a clear change was observed. The variation in heating and cooling was less than 5 K with small quaternary additions, but alloying of 8% Fe increased this difference to 18 K. Alloys with close Ni/Mn/Ga-ratio showed only minor differences in solidus and liquidus temperatures, but if there was a clear change in the Ni/Mn-ratio even those alloys having close e/a ratios showed a clear difference in melting behavior. When Ni/Mn is 1.5-with higher values not clear region could be determined.

    Original languageEnglish
    Title of host publicationESOMAT 2009 - 8th European Symposium on Martensitic Transformations
    EditorsP Sittner, Paidar, L Heller, H Seiner
    PublisherEDP Sciences
    Number of pages6
    ISBN (Print)978-2-7598-0480-1
    Publication statusPublished - 1 Sept 2009
    MoE publication typeA4 Conference publication
    EventEuropean Symposium on Martensitic Transformations - Prague , Czech Republic
    Duration: 7 Sept 200911 Sept 2009
    Conference number: 8


    ConferenceEuropean Symposium on Martensitic Transformations
    Abbreviated titleESOMAT
    Country/TerritoryCzech Republic


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