Pérez de Landazábal Berganzo, José IgnacioRecarte Callado, VicenteSánchez-Alarcos Gómez, VicenteJiménez Ruiz, M.Cesari, Eduard2020-01-072021-07-1520191359-646210.1016/j.scriptamat.2019.04.035https://academica-e.unavarra.es/handle/2454/36006The relevance of the entropy and in particular the outstanding role of the magnetic contribution is analyzed in a non-equilibrium arrested austenite phase in a Ni 45 Mn 36.7 In 13.3 Co 5 metamagnetic shape memory alloy. The Debye and Bragg-Williams approximations have been used to analyze and quantify the vibrational and magnetic contributions respectively, to the total entropy change linked to the martensitic transformation. The sign on the entropy change associated to the forward austenite to martensite transformation is different depending on whether it occurs at low or at high temperature as a consequence of the different vibrational and magnetic contributions.13 p.application/pdfeng© 2019 Acta Materialia Inc. Published by Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0.Ferromagnetic shape memory alloysMartensitic phase transformationThermodynamicsMagnetic entropyinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess