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Entropy 2014, 16(5), 2756-2767; doi:10.3390/e16052756
Article

Long-Range Atomic Order and Entropy Change at the Martensitic Transformation in a Ni-Mn-In-Co Metamagnetic Shape Memory Alloy

1
,
1,* , 1
,
2
 and
3,4
1 Departamento de Física, Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona, Spain 2 Departament de Física, Universitat de les Illes Balears, Ctra. de Valldemossa, km 7.5, E-07122 Palma de Mallorca, Spain 3 Instituto de Ciencia de Materiales de Aragón, CSIC - Universidad de Zaragoza, 50009 Zaragoza, Spain 4 Institut Laue Langevin, F-38042 Grenoble, France
* Author to whom correspondence should be addressed.
Received: 4 April 2014 / Revised: 28 April 2014 / Accepted: 14 May 2014 / Published: 19 May 2014
(This article belongs to the Special Issue Entropy in Shape Memory Alloys)
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Abstract

The influence of the atomic order on the martensitic transformation entropy change has been studied in a Ni-Mn-In-Co metamagnetic shape memory alloy through the evolution of the transformation temperatures under high-temperature quenching and post-quench annealing thermal treatments. It is confirmed that the entropy change evolves as a consequence of the variations on the degree of L21 atomic order brought by thermal treatments, though, contrary to what occurs in ternary Ni-Mn-In, post-quench aging appears to be the most effective way to modify the transformation entropy in Ni-Mn-In-Co. It is also shown that any entropy change value between around 40 and 5 J/kgK can be achieved in a controllable way for a single alloy under the appropriate aging treatment, thus bringing out the possibility of properly tune the magnetocaloric effect.
Keywords: Ni-Mn-In-Co; entropy change; atomic order; martensitic transformation; metamagnetic shape memory alloys Ni-Mn-In-Co; entropy change; atomic order; martensitic transformation; metamagnetic shape memory alloys
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Sánchez-Alarcos, V.; Recarte, V.; Pérez-Landazábal, J.I.; Cesari, E.; Rodríguez-Velamazán, J.A. Long-Range Atomic Order and Entropy Change at the Martensitic Transformation in a Ni-Mn-In-Co Metamagnetic Shape Memory Alloy. Entropy 2014, 16, 2756-2767.

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