Tb_xDy_(1-x)(Fe_(0.6)Co_(0.4))_2合金的磁性和磁致伸缩性能

Magnetic and magnetostrictive properties of Tb_xDy_(1-x)(Fe_(0.6)Co_(0.4))_2 alloys

利用电弧熔炼法制备Tb_xDy_(1-x)(Fe_(0.6)Co_(0.4))_2合金(0.27≤x≤0.40),对合金的磁性和磁致伸缩性能进行研究。利用XRD、交流初始磁化率测试仪、超导量子干涉仪和标准应变测试仪,对样品的物相组成、居里温度、磁化曲线和磁致伸缩性能进行表征。结果表明:当x≤0.27时合金的易磁化方向为á100?方向,当x≥0.30时合金的易磁化方向变为〈 111〉方向;合金的居里温度随x的增加而增加;x=0.32附近时合金的磁晶各向异性常数K_1有极小值,室温时合金在x=0.32附近时达到各向异性补偿;当x=0.32时饱和磁致伸缩系数达到9.57×10^(-4);随Co含量的增加,合金的各向异性补偿点向Tb含量高的方向移动。Tb_(0.32)Dy_(0.68)(Fe_(0.6)Co(0.4))_2合金具有高磁致伸缩系数和低各向异性,是一种实用的磁致伸缩候选材料。

The magnetic and magnetostrictive properties of Tb_xDy_(1-x)(Fe_(0.6)Co_(0.4))_2(0.27≤x≤0.40)alloys fabricated by arc melting were investigated. The phase, Curie temperature, magnetization curves and magnetostriction of alloys were tested by X-ray diffractometer, AC initial susceptibility, superconducting quantum interference device(SQUID) magnetometer and standard strain gauge technique, respectively. The results show, the easy magnetization direction at room temperature of alloys lies along the 〈 100〉 axis in alloys with x≤0.27, while it lies along the 〈 111〉axis as x≥0.30; Curie temperature increases with increasing terbium content; at room temperature the magnetocrystalline anisotropy constant K_1 reaches the minimum value at x=0.32, indicating that it is near the composition for anisotropy compensation; the large saturation magnetostriction λ_s=9.67×10^(-4) is observed at x=0.32; Co substitution for Fe changes the composition for the anisotropy compensation at room temperature to the Tb-rich side. Tb_(0.32)Dy_(0.68)(Fe_(0.6)Co_(0.4))_2, with high magnetostriction and low anisotropy, is regarded as a good candidate material for magnetostriction applications.