Properties of Co-alloyed Ni-Fe-Ga Ferromagnetic Shape Memory Alloys

It is experimentally found that in the Ni 54 Fe 20- x Co x Ga 26 ferromagnetic shape memory alloys, Co variation from 0 to 9 at.% leads to: (i) almost linear change of martensitic transformation temperatures from −70 °C to 120 °C; (ii) a non-monotonous change of the Curie temperature, and (iii) a li...

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Bibliographic Details
Published in:Journal of materials engineering and performance 2009-08, Vol.18 (5-6), p.548-553
Main Authors: Chernenko, V. A., Oikawa, K., Chmielus, M., Besseghini, S., Villa, E., Albertini, F., Righi, L., Paoluzi, A., Müllner, P., Kainuma, R., Ishida, K.
Format: Article
Language:English
Subjects:
Alloys
Characterization and Evaluation of Materials
Corrosion and Coatings
Curie temperature
Engineering Design
Ferromagnetism
Martensitic transformations
Materials engineering
Materials Science
Quality Control
Reliability
Safety and Risk
Saturation (magnetic)
Shape memory alloys
Superelasticity
Tribology
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Summary:It is experimentally found that in the Ni 54 Fe 20- x Co x Ga 26 ferromagnetic shape memory alloys, Co variation from 0 to 9 at.% leads to: (i) almost linear change of martensitic transformation temperatures from −70 °C to 120 °C; (ii) a non-monotonous change of the Curie temperature, and (iii) a linear decrease of saturation magnetization from 60 to 43 Am 2 /kg. The selected alloys grown as single crystals have been (magneto-) mechanically tested. The superelastic effect has been measured to be about 4%. The magneto-strain shows a training effect which is an evidence of the effect of magnetic-field-induced twin-boundary motion.
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-009-9425-7