Transformation behavior and inverse caloric effects in magnetic shape memory Ni44-xCuxCo6Mn39Sn11 ribbons

• Published in: Journal of alloys and compounds Vol. 721; pp. 172 - 181
• Main Authors: Wójcik, A., Maziarz, W., Szczerba, M.J., Sikora, M., Żywczak, A., Aguilar-Ortiz, C.O., Álvarez-Alonso, P., Villa, E., Flores-Zúñiga, H., Cesari, E., Dutkiewicz, J., Chernenko, V.A.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.10.2017; Elsevier BV
• Subjects: Copper; Effects; Elastocaloric effect; Entropy; Heusler alloys; Magnetic alloys; Magnetic fields; Magnetic properties; Magnetocaloric effect; Martensitic transformation; Martensitic transformations; Melt-spun ribbons; Ni-Co-Mn-Sn Heusler alloys; Nickel base alloys; Phase transitions; Shape memory alloys; Size effects; Thermoelastic properties; Martensitic transformation; Melt-spun ribbons; Magnetocaloric effect; Elastocaloric effect; Ni-Co-Mn-Sn Heusler alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2017.05.337

An influence of the Cu doping on structural, magnetic and thermoelastic properties of the Heusler Ni44-xCuxCo6Mn39Sn11 (x = 1–4 at%) ribbons has been investigated. It is found that the addition of Cu stabilizes austenite phase. Martensite transformation (MT) temperatures generally decrease when Cu concentration increases, which is attributed to the atom size effect. The inverse magnetocaloric and elastocaloric effects in the vicinity of MT under moderate magnetic fields and stresses have been evaluated. Small Cu addition enhances both effects as compared to quaternary Ni–Co–Mn–Sn alloy. The magnetic entropy change under low magnetic field of 15 kOe increases from 2.9 J kg−1K−1 for Cu0 to 6.3 J kg−1K−1 for Cu2. [Display omitted] •Cu substitution for Ni stabilizes austenite.•TM and TcA decrease with the replacement of Ni by Cu.•Addition of 2 at% of Cu enhances both magneto- and elastocaloric effect.•Inverse elastocaloric effect is related to stress-induced structural transformation.