采用区熔定向凝固方法,制备出近似<110>取向Tb0.36Dy0.64(Fe0.85Co0.15)2合金棒. 采用交流阻抗分析仪测定其在不同偏磁场和预压应力条件下的阻抗谐振频率,求出磁机械耦合系数(k33). 结果表明, 在无预压应力状态,k33随偏磁场的增大而增加, 在50.9 kA/m达到峰值0.513; 施加10 MPa的轴向预压应力状态, k33值降低, 其原因是预压应力导致71°畴壁能增加,阻碍了磁矩在磁场中的运动, 使得磁能与机械能之间的能量转换效率降低.
<110> oriented crystals Tb0.36Dy0.64(Fe0.85Co0.15)2 have been prepared by zone melting directional solidification method. The magnetomechanical coupling factor (k33) was determined by resonance/anti-resonance method in low bias fields. It was found that k33 is sensitive to both the bias field and the compressive pre-stress. Without compressive pre-stress, optimum k33 can be obtained with the value of 0.513 at a bias field of 50.9 kA/m. When applying a compressive pre-stress of 10 MPa, relatively lower k33 was obtained. It was attributed that extra energy of 71° domain wall is induced by the compressive pre-stress, which hinders the movement of magnetic moments or domain walls, decreasing the transition efficiency between the magnetic and mechanical energies.
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