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Entropy 2015, 17(2), 646-657; doi:10.3390/e17020646

Thermal and Structural Analysis of Mn49.3Ni43.7Sn7.0 Heusler Alloy Ribbons

1
Department of Physics, University of Girona, Campus Montilivi s/n, Girona 17071, Spain
2
Laboratory of Inorganic Chemistry, UR 11ES73, University of Sfax, B.P.1171, Sfax 3000, Tunisia
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 14 November 2014 / Revised: 26 January 2015 / Accepted: 28 January 2015 / Published: 2 February 2015
(This article belongs to the Section Thermodynamics)
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Abstract

The martensitic transformation and the solidification structures of Mn49.3Ni43.7Sn7.0 alloy ribbons prepared by melt-spinning were investigated by means of scanning electron microscopy, X-ray diffraction and differential scanning calorimetry. In those experiments special attention was given to melt spinning processing parameters such as the linear surface speed of the copper wheel rotating, the injection overpressure and the distance between wheel and injection quartz tube. Transformation entropy was found higher when increasing linear surface speed or the distance from injection point to wheel. The resulting samples showed chemical compositions close to the nominal ones and, at room temperature, crystallized in a monoclinic single-phase martensite with 14M modulation (without a significant variation in the cell parameters). Strong dependence of ribbon thickness on processing parameters was found. The average grain size varied between 1.6 and 6.6 μm, while the start temperature of the martensitic temperature varied from 394 to 430 K. View Full-Text
Keywords: entropy; enthalpy; X-ray diffraction; magnetic shape memory entropy; enthalpy; X-ray diffraction; magnetic shape memory
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

Bachaga, T.; Daly, R.; Khitouni, M.; Escoda, L.; Saurina, J.; Suñol, J.J. Thermal and Structural Analysis of Mn49.3Ni43.7Sn7.0 Heusler Alloy Ribbons. Entropy 2015, 17, 646-657.

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