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Material design and shape memory properties of smart composites composed of polymer and ferromagnetic shape memory alloy particles

机译：聚合物和铁磁形状记忆合金颗粒组成的智能复合材料的材料设计和形状记忆性能

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摘要

Ferromagnetic shape memory alloys (FSMAs) such as NiMnGa are expected to be new practical actuator materials with high driving frequency by magnetic field and large strain due to the shape memory effect (SME). However, the brittleness and poor workability of FSMAs, especially at a polycrystalline state, are serious problems and should be improved for a practical use. From this viewpoint a smart composite has been designed by a combination of a polymer matrix and FSMA particles (FSMAP), and a systematic investigation has been done for a NiMnGa-FSMAP/epoxy smart composite. This paper summarizes the design concept and some experimental results of the smart composite. It is pointed out that the single-crystal NiMnGa-FSMAP are easily made by mechanical crush due to the brittleness of FSMAs, and microstructural control is also possible by applying magnetic field during curing. Experimental study revealed that the NiMnGa-FSMAP/epoxy smart composites exhibit both tensile ductility and SME, and that shape memory properties become improved by decreasing particle size of FSMAP. It is concluded that the FSMAP/polymer smart composite has a large potential to be a new practical actuator material.
机译：诸如NiMnGa之类的铁磁形状记忆合金（FSMA）有望成为新型实用的执行器材料，由于形状记忆效应（SME）的缘故，磁场产生的驱动频率高，应变大。然而，FSMA的脆性和可加工性差，特别是在多晶状态下，是严重的问题，应在实际应用中加以改进。从这个角度来看，已经通过聚合物基体和FSMA颗粒（FSMAP）的组合设计了一种智能复合材料，并且对NiMnGa-FSMAP /环氧智能复合材料进行了系统的研究。本文总结了智能复合材料的设计概念和一些实验结果。要指出的是，由于FSMA的脆性，单晶NiMnGa-FSMAP易于通过机械破碎来制备，并且通过在固化期间施加磁场也可以进行微结构控制。实验研究表明，NiMnGa-FSMAP /环氧树脂智能复合材料既具有拉伸延展性，又具有SME的特性，并且通过减小FSMAP的粒径可以改善形状记忆性能。结论是，FSMAP /聚合物智能复合材料具有很大的潜力，可以成为新型实用的执行器材料。

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