Aging behavior of Ni-Mn-Ga/silicone particulate composites exhibiting large recoverable magnetostrain

Single crystalline Ni-Mn-Ga particles/silicone composites are new ferromagnetic shape memory materials, exhibiting a large reversible magnetic field induced strain (MFIS), are greatly demanded for actuators and sensors toward future technologies. In the present work, we studied a long-term aging effect on the mechanical and recoverable MFIS properties of the Ni-Mn-Ga/silicone particulate composites containing different amounts of filler. It was shown that despite a strong decline of the effective stiffness of pure silicone during long aging, the stiffness reduction of composites was much less pronounced and barely affected the characteristics of the large recoverable MFIS.

单晶Ni - Mn - Ga颗粒/硅树脂复合材料是新型铁磁形状记忆材料，具有较大的可逆磁场诱导应变（MFIS），在面向未来技术的执行器和传感器方面有很大需求。在本研究中，我们研究了长期时效对不同填充量的Ni - Mn - Ga/硅树脂颗粒复合材料的力学性能和可恢复MFIS性能的影响。结果表明，尽管纯硅树脂在长时间时效过程中有效刚度大幅下降，但复合材料的刚度降低不太明显，且几乎不影响大的可恢复MFIS的特性。