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对磁场和应力场共同作用下的单晶铁磁形状记忆合金的力学特性进行了实验测试与分析,分别获得了单晶Ni2MnGa试样在不同的压应力时、两个不同角度的磁场作用下的磁场-应变曲线。结果表明,当磁场垂直于应力时,磁场方向的磁致应变要远小于应力方向的磁致应变;当磁场平行于应力时,磁场方向的磁致应变要小于垂直于磁场方向的磁致应变,其磁致应变滞后环的面积远小于磁场垂直于应力时的滞后环面积。这为铁磁形状记忆合金在工程中的应用提供一定的指导作用。
The mechanical properties of the single-crystal ferromagnetic shape memory alloy under the combined action of magnetic field and stress field were experimentally tested and analyzed. The effects of two different magnetic fields on the compressive stress of single-crystal Ni2MnGa specimens were obtained respectively Magnetic field - strain curve. The results show that when the magnetic field is perpendicular to the stress, the magnetic strain in the direction of the magnetic field is far less than the magnetic strain in the direction of the stress. When the magnetic field is parallel to the stress, the magnetic strain in the direction of the magnetic field is smaller than the magnetic strain in the direction perpendicular to the magnetic field. The area of the magnetostrictive hysteresis loop is much smaller than the hysteresis loop area when the magnetic field is perpendicular to the stress. This provides a guidance for the application of ferromagnetic shape memory alloy in engineering.