Magnetic-field-dependent microstructure evolution and magnetic properties of Tb0.27Dy0.73Fe1.95 alloy during solidification
Magnetic-field-dependent microstructure evolution and magnetic properties of Tb0.27Dy0.73Fe1.95 alloy during solidification
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DOI：
10.1016/j.jmmm.2014.01.002
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发表时间：
2014-05
影响因子：
2.7
通讯作者：
Yin Liu;Qiang Wang;Iwai Kazuhiko;Yi Yuan;Tie Liu;Jicheng He
中科院分区：
文献类型：
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作者：
Yin Liu;Qiang Wang;Iwai Kazuhiko;Yi Yuan;Tie Liu;Jicheng He
研究了磁场强度对Tb0.27Dy0.73Fe1.95合金缓冷凝固过程的影响。我们研究了磁场强度对这种超磁致伸缩合金的微观结构、磁化强度和磁致伸缩性能的影响。我们发现，经过磁场处理的凝固后，试样的显微组织具有明显的晶粒排列，并显示出磁各向异性。晶体取向从无场处理中的随机变为在<110>1和2.2 T的磁通密度下沿沿着方向取向，并且<111>在4.4 T的磁通密度下沿沿着易磁化轴取向。结果表明，随着磁通密度的增加，样品在各种应力下的磁致伸缩系数均有所提高。电场处理后的d33和k33值以及能量转化效率都有明显的提高。
We report on the influence of magnetic field strength on the alloy Tb0.27Dy0.73Fe1.95during slow-cooling solidification. We examined the effect of magnetic field strength on microstructure, magnetization, and magnetostrictive properties of this giant magnetostrictive alloy. We found that after field-treated solidification, the microstructure of specimens had a distinct grain arrangement and displayed magnetic anisotropy. The crystal orientation changed from random in the field-free treatment to aligned along the <110> direction in flux densities of 1 and 2.2 T, and along the easy magnetization axis <111> at a flux density of 4.4 T. In consequence, the magnetostrictive coefficient of the samples under various stresses improved with increasing magnetic flux density. Both thed33andk33values and the energy transformation efficiency of the field-treated specimens showed strong enhancements.