Abstract
The martensitic transformation of a magnetic shape memory alloy of composition Ni54Mn24Ga22 has been studied by Flash DSC at 10,000 K/s heating rate. The alloy was deposited directly onto the Flash DSC chip by magnetron sputtering through a metallic mask. The chip was heated at 500 °C during the deposition in order to obtain the correct structure of the films. Adherence of the films to the chip was possible only by depositing a thin Cr buffer layer. The transformation can be detected without problem and the associated enthalpy determined. The transformation temperatures are similar to the values obtained in a witness film. The enthalpy, however, is lower than the corresponding to the bulk alloy, but no reference film of the same characteristics is available for comparison.
Keywords
- Martensitic Transformation
- Heusler Compound
- Transformation Enthalpy
- Magnetic Shape Memory Alloy
- Copper Shield
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Acknowledgments
The authors wish to thank Dr. Andrey Svalov (Department of Electricity and Electronics UPV/EHU, Bilbao, Spain), for his assistance with the Sputtering, to Iñaki Elorriaga, Mettler-Toledo representative in Bilbao, for providing the Flash DSC chips free of charge, and Prof. Angel Alegría and Dr. Daniele Cagialosi (Institute of Physics of Materials, UPV/EHU-CSIC, San Sebastian, Spain) for allowing to carry out the Flash DSC measurements in their instrument. Funding of the Spanish Ministry of Economy and Competitiveness (MINECO) under grants MAT2011-28217 and MAT2014-56116-C4-1-3-4-R, and Basque Industry Department under the ACTIMAT project is greatly acknowledged.
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Barandiaran, J.M., Aseguinolaza, I.R., Mota-Cobián, A., Chernenko, V.A. (2016). Martensitic Transformation of NiMnGa Shape Memory Alloys Thin Films Studied by Flash DSC. In: Schick, C., Mathot, V. (eds) Fast Scanning Calorimetry. Springer, Cham. https://doi.org/10.1007/978-3-319-31329-0_23
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