张洪波
,
蒋成保
,
徐惠彬
金属学报
采用区熔定向凝固技术制备了<110>取向(Tb0.36Dy0 64)1-xHoxFe2合金，研究了在0MPa、5MPa、10MPa不同预压力下该合金的磁致伸缩性能，及其磁致伸缩的滞后特性。结果表明：在外加轴向压应力作用下，<110>取向(Tb0.36Dy0 64)1-xHoxFe2合金具有明显的磁致伸缩“跳跃效应”；在x<0.3时(Tb0.36Dy0 64)1-xHoxFe2合金在较宽的温度范围（-60 oC—80 oC）内具有巨磁致伸缩特性；随Ho含量的增加，其磁致伸缩滞后显著降低。在外加压力为0MPa、5MPa、10MPa时，相对于滞后宽度为104Oe，135Oe，166Oe的Tb0.36Dy0.64Fe1.95合金，在Ho含量为x=0.1，即Tb0.324Dy0.576Ho0.1Fe1.95合金滞后宽度减小为93Oe、116Oe、137Oe，减小幅度分别为10.6％、14.1％、17.5％；在Ho含量为x=0.2时，即Tb0.288Dy0.512Ho0.2Fe1.95合金，滞后宽度减小为75Oe、108Oe、129Oe，减小幅度分别为27.9％，20.2％，22.3％，在Ho含量为x=0.3，即Tb0.252Dy0.448Ho0.3Fe1.95合金，滞后宽度减小为54Oe、88Oe、98Oe，减小幅度分别为48.1％，34.8％，41.0％。
关键词:
TbDyHoFe合金
,
directional solidification
,
Magnetostriction
,
hysteresis
张俊峰
物理测试
本文采用小角转动法（Small-Angle Magnetization Rotation）对（Co(77-x)FexSi8B15（x=4,5,7））钴基玻璃包覆非晶丝的磁致伸缩系数进行了测量，研究了拉应力（σ）对不同成分的钴基玻璃包覆非晶丝磁致伸缩系数的影响。实验结果表明：三种成分玻璃包覆非晶丝的磁致伸缩系数均随着外应力的增加逐渐减小；Co72Fe5Si8B15玻璃包覆非晶丝的磁致伸缩系数随着外应力的增加从+1.1×10-7 (σ=0MPa) 变为-3.3×10-7 (σ=1880MPa)，存在一个由正变负的过程。
关键词:
玻璃包覆
,
Small Angle Magnetization Rotation
,
Magnetostriction
,
null
白夏冰
,
马天宇
,
蒋成保
金属学报
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.
关键词:
磁致伸缩
,
Magnetomechanical coupling factor
,
Bias field
,
Compressive pre-stress
Hongchuan JIANG
材料科学技术（英）
To increase the low-field magnetostriction of TbFe films, the influences of sputtering angles and annealing temperatures on its magnetic and magnetostrictive performances were systematically investigated. With the change in sputtering angles from 90℃ to 15℃, the in-plane magnetization of TbFe films, at 1600 kA• m-1 external field, is strongly increased. An enhancement in the in-plane magnetostrictive coefficient of the films at 40 kA•m-1 is also observed. A detection of magnetic domains by MFM (magnetic force microscopy) indicates that the easy magnetization direction shifts gradually from perpendicular to parallel to the film plane with decreasing sputtering angles. Annealing can enhance the magnetization and magnetostriction of the TbFe films. However, at too high annealing temperature, both the magnetization and magnetostriction of the TbFe films were suppressed to some extent.
关键词:
TbFe films
,
null
,
null
,
null
,
null
Jiuchun YAN
,
Shixiong LU
,
Shiqin YANG
,
Shiyu HE
材料科学技术（英）
A model of magnetostrictive strain for polymer-bonded Terfenol-D composite is presented, which is composed of a submodel for the average strain of Terfenol-D composite and a magnetostriction submodel for Terfenol-D particles. Simulated results show that the saturation magnetostriction ¸λs is very closely with experimental results, although there exists some difference between the calculated and the experimental results under low applied magnetic field. The saturation magnetostriction of the composites increases with the particle fraction (vI=72.5～90 vol. pct) in the simulated and experimental results, but the simulation result is not ideal when the particle fraction is higher than 85%.
关键词:
Polymer-bonded Terfenol-D composite
,
null
,
null
