抄録
Since ferromagnetic shape memory alloy (FSMA) was discovered, the various researches has been done for the industrial application as sensor and actuator materials. However, the detailed mechanism of the magnetostriction, which appears in polycrystal FSMA, has not been clarified still. In this study, Fe-29.6at%Pd and Fe-23.0at%Pt alloy of the ferrous material with the ductility were made to be the polycrystal ribbon by the rapid solidification apparatus. The investigation of giant magnetostriction, which appeared in the polycrystal FSMA ribbon, was made to be a purpose. As results: 1) The magnetostriction of rapidly solidified ribbon is bigger over 10 times than the bulk. 2) The coercive force of the ribbon has strong directional dependency. 3) From magnetostriction measurement, austenite phase transformation occurred in the 400K vicinity. While in magnetic properties and X-ray diffraction, austenite phase transformation occurred in the 300K vicinity. In addition, shape recovery test indicated 2-steps transformation.
