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Metals 2015, 5(2), 484-503; doi:10.3390/met5020484

Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles

1
Max-Planck-Institute for Chemical Physics of Solids (MPI CPFS), Noethnitzer Str. 40, DE-01187 Dresden, Germany
2
Institute of Materials for Electronics and Magnetism, National Research Council (IMEM-CNR), Parco Area delle Scienze 37/A, I-43124 Parma, Italy
3
Laboratory of Micro and Submicro Enabling Technologies for Emilia-Romagna (MIST E-R), via Gobetti 101, I-40129 Bologna, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Kurt R. Ziebeck
Received: 20 February 2015 / Revised: 11 March 2015 / Accepted: 12 March 2015 / Published: 25 March 2015
(This article belongs to the Special Issue Shape Memory Alloys 2014)
View Full-Text   |   Download PDF [2528 KB, uploaded 25 March 2015]   |  

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. View Full-Text
Keywords: phase transitions; magnetism; X-ray and electron scattering phase transitions; magnetism; X-ray and electron scattering
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Fichtner, T.; Wang, C.; Levin, A.A.; Kreiner, G.; Mejia, C.S.; Fabbrici, S.; Albertini, F.; Felser, C. Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles. Metals 2015, 5, 484-503.

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