Magnetostriction of ⟨110⟩ oriented crystals in the TbDyFe alloy
Magnetostriction of ⟨110⟩ oriented crystals in the TbDyFe alloy
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DOI：
10.1016/s0925-8388(03)00019-7
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发表时间：
2003-05-12
影响因子：
6.2
通讯作者：
Xu, HB
中科院分区：
文献类型：
--
作者：
Zhao, Y;Jiang, CB;Xu, HB
采用区熔定向凝固技术，在30 ~ 720 mm/h的大速度范围内成功地制备了TbDyFe磁致伸缩合金定向晶。研究了合金的凝固组织和磁致伸缩性能。结果表明，TbDyFe合金具有平面、胞状和枝晶的凝固形貌，并可形成择优取向。在15 MPa的预应力下，以240 mm/h的速度取向样品获得了1965 × 10（-6）的磁致伸缩性能。在高速（n ≥ 120 mm/h）下，取向晶体中出现明显的磁致伸缩跳跃效应。相反，没有磁致伸缩跳跃效应出现在低速生长的样品（nu=30 mm/h）也具有良好的取向。提出了两种孪晶生长机制。单{111}孪晶系统生长导致磁致伸缩跳跃效应，双{111}孪晶系统生长导致磁致伸缩跳跃效应消失。实验数据与根据两种孪晶生长机制粗略计算的理论磁致伸缩值基本一致。(C)2003 Elsevier Science B. V.保留所有权利。
oriented crystals of a TbDyFe magnetostrictive alloy have been successfully prepared by zone melting unidirectional solidification with a large velocity range from 30 to 720 mm/h. The solidified morphologies and the magnetostriction have been investigated. It was found that preferred orientation can form in the TbDyFe alloy with planar, cellular and dendritic solidified morphologies. The satisfactory magnetostrictive property of 1965X10(-6) was obtained under 15 MPa pre-stress in the oriented sample with a velocity of 240 mm/h. An obvious magnetostriction jump effect was observed in the oriented crystals with high velocity (nugreater than or equal to120 mm/h). Conversely, no magnetostriction jump effect appeared in the low velocity grown samples (nu=30 mm/h) also with an excellent orientation. Two kinds of twin growth mechanism are proposed. The single-{111}-twin system growth leads to the magnetostriction jump effect, and the two-{111}-twin system growth results in a lack of the magnetostriction jump effect. The experimental data are basically consistent with the theoretical magnetostriction values, roughly calculated by the two kinds of the twin growth mechanism. (C) 2003 Elsevier Science B.V. All rights reserved.