Effects of annealing on the martensitic transformation of Ni-based ferromagnetic shape memory heusler alloys and nanoparticles

Fichtner T, Wang C, Levin AA, Kreiner G, Mejia CS, Fabbrici S, Albertini F, Felser C (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Metals MDPI

Book Volume: 5

Pages Range: 484-503

Journal Issue: 2

DOI: 10.3390/met5020484

Abstract

We report on the effects of annealing on the martensitic phase transformation in the Ni-based Heusler system: Mn50Ni40Sn10 and Mn50Ni41Sn9 powder and Co50Ni21Ga32 nanoparticles. For the powdered Mn50Ni40Sn10 and Mn50Ni41Sn9 alloys, structural and magnetic measurements reveal that post-annealing decreases the martensitic transformation temperatures and increases the transition hysteresis. This might be associated with a release of stress in the Mn50Ni40Sn10 and Mn50Ni41Sn9 alloys during the annealing process. However, in the case of Co50Ni21Ga32 nanoparticles, a reverse phenomenon is observed. X-ray diffraction analysis results reveal that the as-prepared Co50Ni21Ga32 nanoparticles do not show a martensitic phase at room temperature. Post-annealing followed by ice quenching, however, is found to trigger the formation of the martensitic phase. The presence of the martensitic transition is attributed to annealing-induced particle growth and the stress introduced during quenching.

Involved external institutions

Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Istituto dei Materiali per l'Elettronica ed il Magnetismo IMEM IT Italy (IT)

How to cite

APA:

Fichtner, T., Wang, C., Levin, A.A., Kreiner, G., Mejia, C.S., Fabbrici, S.,... Felser, C. (2015). Effects of annealing on the martensitic transformation of Ni-based ferromagnetic shape memory heusler alloys and nanoparticles. Metals, 5(2), 484-503. https://doi.org/10.3390/met5020484

MLA:

Fichtner, Tina, et al. "Effects of annealing on the martensitic transformation of Ni-based ferromagnetic shape memory heusler alloys and nanoparticles." Metals 5.2 (2015): 484-503.

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