It is experimentally found that in the Ni54Fe20-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 A degrees C to 120 A degrees 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.
Properties of Co-alloyed Ni-Fe-Ga Ferromagnetic Shape Memory Alloys / V. A., Chernenko; K., Oikawa; M., Chmielus; S., Besseghini; E., Villa; F., Albertini; Righi, Lara; A., Paoluzi; P., Müllner; R., Kainuma; K., Ishida. - In: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE. - ISSN 1059-9495. - 18:5-6(2009), pp. 548-553. [10.1007/s11665-009-9425-7]
Properties of Co-alloyed Ni-Fe-Ga Ferromagnetic Shape Memory Alloys
RIGHI, Lara;
2009-01-01
Abstract
It is experimentally found that in the Ni54Fe20-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 A degrees C to 120 A degrees 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
