NiMnGa粒子分散スマートコンポジットの形状記憶特性(OS7-1 形状記憶合金の作製とその変形特性,OS7 形状記憶合金の特性と応用化技術)

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A ferromagnetic shape memory alloy (FSMA) NiMnGa is expected to be a new advanced actuator material equipping with large actuation strain and quick response. However, since NiMnGa is a Heusler-type (L21-type) intermetallic compound, the intrinsic brittleness is a serious problem for practical applications. Then, a new type of smart composite is designed and developed in this study to exhibit both ferromagnetic shape memory effect (FSMAE) and ductility by mixing a polymer matrix with NiMnGa FSMA particles (FSMAP). The matrix polymer enhances ductility and NiMnGa FSMAP brings FSME. Other features are easy fabrication of the composites and easy shaping. In this study, the several kinds of NiMnGa FSMAP based smart composites are made by varying chemical composition, volume fraction, particle size- of NiMnGa FSMAP as well as variation of matrix polymer. The shape memory properties of the smart composites are reported in terms of powder size and applied stress using dynamic mechanical analysis (DMA) mainly. The shape recovery of composites was confirmed in strain-temperature curves obtained by DMA. It is also found that the shape memory properties depend on volume fraction of FSMA, and the shape memory properties become better with decreasing powder size. This is because the amount and size of defects such as pores introduced during curing decreases with decreasing particle size. It is concluded that the FSMAP/polymer smart composite has a large potential to be a new practical actuator material.
一般社団法人日本機械学会の論文
2004-07-20

NiMnGa粒子分散スマートコンポジットの形状記憶特性(OS7-1 形状記憶合金の作製とその変形特性,OS7 形状記憶合金の特性と応用化技術)

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