Strain glass behaviour of Ni-Co-Mn-Sn ferromagnetic shape memory alloys

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Abstract

© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.We report the direct experimental observations of the glassy behaviour in Ni-Co-Mn-Sn ferromagnetic shape memory alloys by doping sufficient substitutional point defect Co into the Ni sites (9 at%). The results showed that high level of Co doping had caused the complete suppression of the martensitic transformation and introduction of a strain glass transition in Ni-Co-Mn-Sn alloys. The strain glass transition was definitively characterized by the dynamic mechanical anomalies following the Vogel-Fulcher relationship and the signature nonergodicity of the frozen glass using a zero-field-cooled/field-cooled heating measurement of static strain. The findings clarified the cause of vanishing of the martensitic transformation in Ni-Co-Mn-Sn alloy with high Co doping levels and the generality of glassy state in Ni-Mn based ferromagnetic shape memory alloys with high level of foreign elements doping.
Original languageEnglish
Pages (from-to)317-320
JournalPhysica Status Solidi - Rapid Research Letters
Volume9
Issue number5
DOIs
Publication statusPublished - 2015

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