Shape memory behavior of Ni-Fe-Ga and Ni-Mn-Sn ribbons

E. Villa; C.O Agilar-Ortiz; P. Álvarez-Alonso; J.P. Camarillo; G.A. Lara-Rodriguez; H. Flores-Zúñiga; V.A. Chernenko

doi:10.1051/matecconf/20153305009

All issues

Volume 33 (2015)

MATEC Web of Conferences, 33 (2015) 05009

Abstract

Open Access

Issue		MATEC Web of Conferences Volume 33, 2015 ESOMAT 2015 – 10^th European Symposium on Martensitic Transformations


Article Number		05009
Number of page(s)		6
Section		Magnetic alloys
DOI		https://doi.org/10.1051/matecconf/20153305009
Published online		07 December 2015

MATEC Web of Conferences 33, 05009 (2015)

Shape memory behavior of Ni-Fe-Ga and Ni-Mn-Sn ribbons

E. Villa¹^a, C.O Agilar-Ortiz², P. Álvarez-Alonso³, J.P. Camarillo², G.A. Lara-Rodriguez⁴, H. Flores-Zúñiga² and V.A. Chernenko⁵^,6

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: e.villa@ieni.cnr.it

Abstract

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 T_M ~ 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.

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