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采用电弧熔炼方法制备了Pr0.3TbxDy0.7-xFe1.9Ti0.1(x=0.18～0.21)合金,对样品进行不同条件退火处理,并测量了其磁性能。结果表明:退火前样品都有杂相,并且第二相很大程度上影响样品磁致伸缩;700℃,6d退火处理没有有效消除杂相,样品磁致伸缩没有明显得到改善;而900℃,3d退火处理有效地消除了样品的杂相,尤其是x=0.21的样品,几乎呈现完美的单一的MgCu2型Laves相,磁化强度和磁致伸缩系数均有所增加,当磁场为900kA/m时该样品磁致伸缩系数达到了1.12×10-3。
Pr0.3TbxDy0.7-xFe1.9Ti0.1 (x = 0.18-0.21) alloy was prepared by arc melting method. The samples were annealed under different conditions and their magnetic properties were measured. The results show that the samples before annealing have heterogeneous phases, and the second phase affects the magnetostriction of the samples to a great extent. The annealing at 700 ℃ for 6 days does not effectively eliminate the heterogeneous phase and the magnetostriction of the samples does not improve obviously. However, The 3d annealing treatment effectively eliminated the heterogeneous phase of the sample, especially for the sample with x = 0.21. The almost perfect single MgCu2-type Laves phase showed an increase in both the magnetization and the magnetostriction coefficient. When the magnetic field was 900 kA / m The magnetostriction coefficient of the sample reached 1.12 × 10-3.