Micromechanical Design and Development of NiMnGa-Particles/Pores/Polymer Giant Magnetostrain Composites with High Formability and High Response

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In order to develop new NiMnGa-dispersed polymer based magnetodriven actuator materials, the volume fraction, the crystallographic orientation, the distribution of NiMnGa particles and the introduction of polystyrene form particles were investigated using silicone and epoxy as matrix materials. Here, the polystyrene form particles can be regarded as pores. As the results, in the NiMnGa particle dispersed polymer composites in which NiMnGa particles were fabricated by mechanical crush, non-active NiMnGa particles exist with inappropriate crystallographic orientations. The non-active particles play a role of obstacle for the motion of the other active particles. Due to the chain reaction, the magnetostriction of the composites is suppressed. It is also found that the introduction of polystyrene foam particles is effective to reduce the elastic restriction of matrix and thus the magnetic motion is enhanced. Besides, a survey of new magnetostriction materials was done.