采用电弧熔炼方法制备了Pr_(0.3)Tb_xDy_(0.7-x)Fe_(1.9)Ti_(0.1)(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 ℃,6 d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 ℃,3 d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MgCu_2型Laves相,磁化强度和磁致伸缩系数均有所增加,当磁场为900 kA/m时该样品磁致伸缩系数达到了1.12×10~(-3).
Pr_(0.3)Tb_xDy_(0.7-x)Fe_(1.9)Ti_(0.1)(x=0.18-0.21) alloys were prepared by arc melting and then the samples were annealed under different conditions. Their magnetostriction was studied. The results indicate that the second phase exists in all samples before annealing and greatly influences the magnetostriction of samples. The second phase cannot be eliminated and the magnetostriction can not be improved by 700 ℃, 6 d annealing. However, the second phase can be efficiently eliminated by 900 ℃, 3 d annealing. In particular, for the sample of Pr_(0.3)Tb_(0.21)Dy_(0.49)Fe_(1.9)Ti_(0.1), the pure cubic Laves phase with MgCu_2-type structure was obtained and its magnetization and magnetostriction coefficient increased. It has a high magnetostriction coefficient of about 1.12×10~(-3) at 900 kA/m.
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