Influence of Structural Defects on the Properties of Metamagnetic Shape Memory Alloys
J. I. Pérez-Landazábal,
V. Sánchez-Alarcos,
V. Recarte,
O. A. Lambri,
F. G. Bonifacich,
D. L.R. Khanna,
I. Unzueta,
J.A. García,
F. Plazaola,
J. López-García,
M. Jimenez Ruiz,
J.A. Rodríguez-Velamazán,
E. Cesari
Affiliations
J. I. Pérez-Landazábal
Departamento de Ciencias, Public University of Navarra (UPNa), 31006 Pamplona, Spain
V. Sánchez-Alarcos
Departamento de Ciencias, Public University of Navarra (UPNa), 31006 Pamplona, Spain
V. Recarte
Departamento de Ciencias, Public University of Navarra (UPNa), 31006 Pamplona, Spain
O. A. Lambri
Laboratorio de Materiales, Escuela de Ingeniería Eléctrica, Centro de Tecnología e Investigación Eléctrica, Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario—CONICET, Avda. Pellegrini 250, 2000 Rosario, Argentina
F. G. Bonifacich
Laboratorio de Materiales, Escuela de Ingeniería Eléctrica, Centro de Tecnología e Investigación Eléctrica, Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario—CONICET, Avda. Pellegrini 250, 2000 Rosario, Argentina
D. L.R. Khanna
Departamento de Ciencias, Public University of Navarra (UPNa), 31006 Pamplona, Spain
I. Unzueta
Matematika Aplikatua Saila, Bilboko Ingenieritza Eskola, Euskal Herriko Unibersitatea UPV/EHU, p.k. 644, 48080 Bilbao, Spain
J.A. García
Fisika Aplikatua II Saila, Euskal Herriko Unibersitatea UPV/EHU, p.k. 644, 48080 Bilbao, Spain
F. Plazaola
Elektrizitate eta Elektronika Saila, Euskal Herriko Unibersitatea UPV/EHU, p.k. 644, 48080 Bilbao, Spain
J. López-García
Departamento de Ciencias, Public University of Navarra (UPNa), 31006 Pamplona, Spain
M. Jimenez Ruiz
Institut Laue Langevin, 71, Avenue des Martyrs, 38042 Grenoble CEDEX, France
J.A. Rodríguez-Velamazán
Institut Laue Langevin, 71, Avenue des Martyrs, 38042 Grenoble CEDEX, France
E. Cesari
Departament de Física, Universitat de les Illes Balears, Ctra. de Valldemossa, km 7.5, E-07122 Palma de Mallorca, Spain
The production of μ-particles of Metamagnetic Shape Memory Alloys by crushing and subsequent ball milling process has been analyzed. The high energy involved in the milling process induces large internal stresses and high density of defects with a strong influence on the martensitic transformation; the interphase creation and its movement during the martensitic transformation produces frictional contributions to the entropy change (exothermic process) both during forward and reverse transformation. The frictional contribution increases with the milling time as a consequence of the interaction between defects and interphases. The influence of the frictional terms on the magnetocaloric effect has been evidenced. Besides, the presence of antiphase boundaries linked to superdislocations helps to understand the spin-glass behavior at low temperatures in martensite. Finally, the particles in the deformed state were introduced in a photosensitive polymer. The mechanical damping associated to the Martensitic Transformation (MT) of the particles is clearly distinguished in the produced composite, which could be interesting for the development of magnetically-tunable mechanical dampers.
