磁控形状记忆合金Ni_2MnGa解析模型及特性

Model and experimental characteristics of magnetically

系统地阐述了磁控形状记忆合金的微结构、相变机理和形状记忆效应。利用自行设计的实验装置研究了Ni2MnGa合金样品在静态直流下的应力、磁场和形变之间的关系,绘出了不同压应力下磁场强度与变形的实验曲线,给出了O'Handley解析热力学模型,并与实验结果进行了比较。实验结果证明,Ni2MnGa合金变形率随着压应力的增加而减小,随磁场强度的增加而增大。这为Ni2MnGa合金的实际应用打下了理论和实验基础。

The paper introduces microstructure, transition mechanism, shape memory effect of Magnatically Controlled Shape Memory （MSMA）.With self-designed equipment, the static relationship between the deformation of Ni2MnGa alloy sample and the magnetic field is studied. After drawing the experimental curve of different temperatures and stresses, the model of O＇Handley is given. The experimental re：suits confirm that with the increase of magnetic field and decrease of stress, the strain increases. Therefore, the results provide a theoretical and experimental basis for practical application of Ni2MnGa alloy.