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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.57  No.10 (2016)  >  pp.1837-1844

MATERIALS TRANSACTIONS
<<Previous article Vol.57  No.10 (2016)   pp.1837 - 1844 Next article>>

Mobility of Twin Boundaries in Fe-Pd-Based Ferromagnetic Shape Memory Alloys

Federico Guillermo Bonifacich1), Osvaldo Agustín Lambri1), José Ignacio Pérez-Landazábal2) 3), Damián Gargicevich1), Vicente Recarte2) 3), Vicente Sánchez-Alarcos2) 3)
1) CONICET-UNR, Laboratorio de Materiales, Escuela de Ingeniería Eléctrica, Centro de Tecnología e Investigación Eléctrica, Facultad de Ciencias Exactas, Ingeniería y Agrimensura 2) Departamento de Física, Universidad Pública de Navarra, Campus de Arrosadía 3) Institute for Advanced Materials (INAMAT), Universidad Pública de Navarra, Campus de Arrosadía

The mobility of twin boundaries in (at.%) Fe70Pd30, Fe67Pd30Co3 and Fe66.8Pd30.7Mn2.5 has been studied by mechanical spectroscopy. Measurements were carried out in amplitude dependent damping regime. A new model based on the Friedel theory was developed to obtain the activation energy (~2 kJ/mol) for twin boundaries motion. The model describes the amplitude dependent damping from thermally assisted break-away of dislocations. Interaction processes among twin boundaries, dislocations and vacancies during the recovery of the structure are also discussed. Moreover, a damping peak related to a dislocation dragging mechanism controlled by vacancies migration without break-away, earlier reported in Fe-Pd alloys, was also found in Fe-Pd-Co and Fe-Pd-Mn alloys.




Keyword:
iron-palladium based alloys, ferromagnetic shape memory alloys, martensitic transformation, twin boundary, damping

Received: July 01, 2016
Accepted: July 27, 2016 , Published online: September 25, 2016

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