Pages 389-390
In the ferromagnetic shape memory alloy actuator, magnetically induced twin variants grow and they are re-arranged along the favorable orientation to the external magnetic field. In this study, rapidly solidified Fe-30at%Pd alloy foil was by melt-spinning method. From the grain boundary character distribution (GBCD) analysis by SEM/EBSP, this rapid-solidified unique microstructures had strong crystal (100) plane anisotropy by fine columnar grain as well as high frequency low energy (small Σ-value) grain. Thermo-magneto-mechanical properties were measured by cantilever-type internal friction and mechanical spectroscopy equipment in the magnetic field strength controllable coil. Resonance vibration frequency, damping factor and magnetostriction were changed clearly depending on temperature and magnetic field strength. Short annealing for strengthening texture (i.e. crystal anisotropy) seems to work on larger magetostriction and it can be concluded that the repidly solidified, strongly textured ferromagnetic shape memory Fe-Pd alloy has the possibility of new type of giant magnetostrictive sensor/actuator at a narrow range of temperature near inverse As〜Af transformation point.
