摘要
采用区熔定向凝固方法,制备出近似(110)取向Tb_(0 36)Dy_(0.64)(Fe_(0 85)Co_(0.15))_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(k_(33)).结果表明,在无预压应力状态,k_(33)随偏磁场的增大而增加,在50.9 kA/m达到峰值0.513;施加10MPa的轴向预压应力状态,k_(33)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.
Near 〈110〉 oriented Tb0.36Dy0.64（Feo.s5Co0.15）2 alloys were prepared by zone melting directional solidification method. The magnetomechanical coupling factor （κ33） was determined by resonance/anti-resonance method in low bias fields. It was found that κ33 is sensitive to both the bias field and the compressive pre-stress. Under no compressive pre stress, an optimum κ33 equal to 0.513 can be obtained at a bias field of 50.9 kA/m. While under applying a compressive pre-stress of 10 MPa, the κ33 will be lowered due to the pre-stress induced increase of 71° domain wall energy, which hinders the movement of magnetic moments or domain walls, resulting in the decrease of the transition efficiency between thethe magnetic and mechanical energies.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第10期1231-1234,共4页
Acta Metallurgica Sinica
基金
国家自然科学基金项目50471003和50531010
新世纪优秀人才支持计划项目04-0165资助~~
关键词
磁致伸缩
磁机械耦合系数
偏磁场
预压应力
magnetostriction, magnetomechanical coupling factor, bias field,compressive pre-stress
