MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Mobility of Twin Boundaries in Fe-Pd-Based Ferromagnetic Shape Memory Alloys
Federico Guillermo BonifacichOsvaldo Agustín LambriJosé Ignacio Pérez-LandazábalDamián GargicevichVicente RecarteVicente Sánchez-Alarcos
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2016 Volume 57 Issue 10 Pages 1837-1844

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Abstract

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.

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© 2016 The Japan Institute of Metals and Materials
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