Shape memory behavior of Ni-Fe-Ga and Ni-Mn-Sn ribbons
1 CNR IENI Unità di Lecco, 23900 Lecco, Italy
2 División de Materiales Avanzados, IPICYT, 78216 San Luis Potosí, Mexico
3 Departamento de Electricidad y Electrónica, Universidad del País Vasco (UPV/EHU), 48940 Leioa, Spain
4 Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, 04510 México D.F., México
5 Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
6 BCMaterials & University of Basque Country (UPV/EHU), 48080 Bilbao, Spain
a Corresponding author: firstname.lastname@example.org
Magnetic Shape Memory Alloys exhibit multifunctional properties due the martensitic transformation (MT) and accompanying changes in the magnetic subsystem. In this work, melt spun ribbons of nominal composition Ni55Fe16Ga29 (R1) and Ni50Mn40Sn10 (R2) have been produced and characterized by the calorimetric, thermomechanical, mechanical, microscopic and X-ray measurements. The effect of short annealing on MT and thermo-mechanical properties is rather modest and in the case of R2 enhances its brittleness. R1 and R2 as-spun ribbons show MT at TM ~ 340 K and ~ 420 K, respectively. The strain-stress curves for Ni-Fe-Ga in austenitic phase indicate good visco-elastic properties, although the superelastic effect was not well pronounced. Ni-Fe-Ga as-cast and annealed samples, as well as the as-cast Ni-Mn-Sn ribbons, present a shape memory effect with an anomalous contraction and elongation at low external stresses in the course of the forward and reverse MT, consequence of the compressive internal stresses.
© Owned by the authors, published by EDP Sciences, 2015
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