采用区熔定向凝固方法,制备<110>取向Tb0.36Dy0.64(Fe0.85Co0.15)2合金棒.用管式炉,在1000℃进行4h的均匀化处理;沿垂直合金棒轴向,在240kA]m中进行磁场退火处理.研究了热处理方式对合金取向、显微组织和磁致伸缩的影响.结果表明,均匀化处理和磁场退火处理均不改变合金轴向择优取向;均匀化处理后,网状富稀土相球状聚集,有效地提高了合金的磁致伸缩,"跳跃"效应增强;磁场退火处理后,合金在无预压力下的磁致伸缩显著提高,而"跳跃"效应减弱.
<110> oriented crystals Tb0.36Dy0.64(Fe0.85Co0.15)2 were prepared through zone melting unidirectional solidification. A homogenization annealing for 4 h at 1000℃ and a magnetic annealing under 240kA/m were carried out on the rod-shaped samples. The orientations, morphologies and magnetostriction of the Tb0.36Dy0.64(Fe0.85Co0.15)2 rods with unidirectional solidification, homogenization, and magnetic annealing were investigated, respectively. It is found that the magnetostriction can be improved effectively through homogenization annealing, due to the spheroidal variation of the pseudo-eutectic rare-earth-rich phase. The magnetostriction measured under free conditions is significantly improved after magnetic annealing, while the jump effect under a uniaxial compressive stress becomes weaker. The redistribution of the initial moments is suggested to be responsible for this change.
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