2003 年 44 巻 4 号 p. 665-668
Rapidly solidified Ferromagnetic shape memory alloy Fe–29.6 at%Pd ribbon has large magnetostriction of 1000 ppm (0.1%). The strain is caused by martensite twin’s movements induced by magnetic field. In order to determine whether the ribbon is useful for a sensor/actuator material, we investigated a behavior of magnetostriction of Fe–29.6 at%Pd ribbon under tensile stress. Three samples investigated are (1) melt-spinning single-roll ribbon (70 μm), (2) melt-spinning twin-roll ribbon (100 μm), (3) the layered structure of 4 ribbons (280 μm). The magnetostriction for three samples has a maximum, −250 ppm under tensile stress 15–20 MPa, which make to rearrange martensite twin boundary. The results show that rapidly solidified Fe–29.6 at%Pd alloy ribbon should be useful as sensor/actuator materials under low tensile stress.
