Magnetomechanical performance and mechanical properties of Ni-Mn-Ga ferromagnetic shape memory alloys
Magnetomechanical performance and mechanical properties of Ni-Mn-Ga ferromagnetic shape memory alloys
复制标题
Ni-Mn-Ga铁磁形状记忆合金的磁机械性能和力学性能
DOI：
10.1117/12.388253
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发表时间：
2000
影响因子：
1.6
通讯作者：
T. Lograsso
中科院分区：
文献类型：
--
作者：
S. J. Murray;S. Allen;R. O'handley;T. Lograsso
对Ni-Mn-Ga铁磁形状记忆合金进行了应变-外加场和应变-应力测试。场致应变高达6%，迟滞量约为160 kA/m。将计算结果与以滞后为重点的模型预测结果进行了比较。该模型适用于磁场和外载荷相互正交的情况。预测了双相马氏体中屈服应力的磁滞现象。为了了解在没有孪生运动的情况下样品的磁化行为，在机械约束的样品上测量了磁化强度与外加磁场的关系。这些测量给出了磁各向异性，并用于估计退磁场。该模型近似于恒场下应变随应力变化的实测行为。
A Ni-Mn-Ga ferromagnetic shape memory alloy was tested for strain versus applied field and strain versus stress. Field- induced strains up to 6 percent were measured with a hysteresis of about 160 kA/m. The results are compared with the predictions of modeling with a focus on hysteresis. The model is applied to the case in which the magnetic external field and external load are orthogonal to each other. It predicts the magneto-mechanical hysteresis as a function of the yield stress in a twinned martensite. Magnetization versus applied field was measured on a sample that was mechanically constrained in order to understand the magnetization behavior of the sample in the absence of twin motion. These measurements give the magnetic anisotropy and are used to estimate the demagnetization fields. The measured behavior of strain with stress at constant field is approximated by the model.