Study of Non-Homogeneity of Magnetic Field Distribution in Single-Crystal Ni–Mn–Ga Magnetic Shape Memory Element in Actuators Due to Its Anisotropic Twinned Microstructure
Study of Non-Homogeneity of Magnetic Field Distribution in Single-Crystal Ni–Mn–Ga Magnetic Shape Memory Element in Actuators Due to Its Anisotropic Twinned Microstructure
复制标题
执行器中单晶Ni-Mn-Ga磁性形状记忆元件由于其各向异性孪生微结构导致的磁场分布不均匀性的研究
DOI：
10.1109/tmag.2016.2640201
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发表时间：
2017
影响因子：
2.1
通讯作者：
Sanowar H. Khan
中科院分区：
文献类型：
--
作者：
N. Gabdullin;Sanowar H. Khan
磁性形状记忆(MSM)合金是一种相对较新的、非常有前景的智能材料，它响应磁场并在室温下表现出形状记忆效应。最大应变从MSM元件长度的6%到12%不等，具体取决于其微观结构。MSM孪晶低温马氏体相的形状记忆效应和磁场诱导重取向的研究已经进行了近二十年。然而，对于MSM元件中的磁场分布以及其磁导率的变化对偏置磁场的影响还没有得到很好的研究。在本文中，我们提出了一种适用于执行器设计的MSM元件建模方法的扩展。研究和讨论了单晶各向异性和非均匀多变量MSM微观结构引起的退磁效应。通过将计算结果与已报道的测量数据进行比较，验证了该方法的有效性。
Magnetic shape memory (MSM) alloys are relatively new and very promising “smart” materials that respond to magnetic fields and exhibit the shape memory effect at room temperature. Maximum strain varies from 6% to 12% of the MSM element’s length depending on its microstructure. The shape memory effect and the magnetic field-induced reorientation of MSM twin variants in low-temperature martensite phase have been subject to ongoing research for almost two decades. However, the magnetic field distribution in the MSM elements and effects of its varying magnetic permeability on bias magnetic field are not well studied. In this paper, we present an extension to the existing modeling approach for MSM elements applicable to actuator design. The effects arising from single-crystal anisotropy and demagnetization effects due to non-homogeneous multi-variant MSM microstructure are studied and discussed. The proposed approach is validated by comparing computational results with the previously reported measurement data.