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

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Received: 4 April 2014; in revised form: 28 April 2014 / Accepted: 14 May 2014 / Published: 19 May 2014
(This article belongs to the Special Issue Entropy in Shape Memory Alloys)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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
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MDPI and ACS Style

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.

AMA Style

Sánchez-Alarcos V, Recarte V, Pérez-Landazábal JI, Cesari E, Rodríguez-Velamazán JA. Long-Range Atomic Order and Entropy Change at the Martensitic Transformation in a Ni-Mn-In-Co Metamagnetic Shape Memory Alloy. Entropy. 2014; 16(5):2756-2767.

Chicago/Turabian Style

Sánchez-Alarcos, Vicente; Recarte, Vicente; Pérez-Landazábal, José I.; Cesari, Eduard; Rodríguez-Velamazán, José A. 2014. "Long-Range Atomic Order and Entropy Change at the Martensitic Transformation in a Ni-Mn-In-Co Metamagnetic Shape Memory Alloy." Entropy 16, no. 5: 2756-2767.


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