Development of Iron-based ferromagnetic shape memory alloys by means of melt spinning technique

抄録

Ferromagnetic shape memory alloys have been developed by means of the melt spinning technique. The alloys are multi-functional materials, which have both the ferromagnetic property and shape memory property. We have focused our interest on Fe-Mn-Si based alloys, which are nonmagnetic material due to high manganese content. To improve ferromagnetic function, we have investigated to add rare earth elements and compared effects of Nd, Sm, Dy, and Ho in detail. The results show that the ferromagnetic functions can be improved by adding up to 1wt% rare earth elements. The additions worked to shift the Curie pint upward and to increas the residual saturation magnetization even after heat-treatment. The heat-treatment has been optimized to obtain the largest saturation magnetization and the perfect shape memory recovery.