Crystal growth of high magnetostrictive polycrystalline Fe81Ga19 alloys

Crystal growth of high magnetostrictive polycrystalline Fe81Ga19 alloys
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高磁致伸缩多晶Fe81Ga19合金的晶体生长

DOI:
10.1016/j.jmmm.2011.11.004
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发表时间:
2012-03
影响因子:
2.7
通讯作者:
Jiang, Chengbao
Jiang, Chengbao
中科院分区:
材料科学3区
文献类型:
--
作者:
Li, Chuan;Liu, Jinghua;Wang, Zhibin;Jiang, Chengbao

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采用感应加热区熔法制备了高磁致伸缩Fe 81 Ga 19合金。研究了合金的微观结构、溶质分配行为、取向演化和磁致伸缩性能。在晶体生长过程中,初始的小晶粒逐渐长大为大的柱状晶,固液界面呈微凹形貌。计算得到平衡溶质分配系数k 0、有效溶质分配系数ke和溶液扩散系数D分别为0.74、0.76和1.04×10− 9 m2/s。在稳定生长阶段,FeGa棒的成分分布均匀,平均含量约为18.50at%Ga,接近名义成分。沿生长方向,薄膜的磁致伸缩由最初的180 ppm增加到305 ppm,薄膜的磁致伸缩随生长方向的变化从约8°逐渐增加到沿着3°。
High magnetostrictive Fe81Ga19alloy was prepared by induction heating zone melting method. The microstructure, solute partition behaviour, orientation evolution and magnetostriction are investigated. During the crystal growth process, the initial small grains gradually grow into large columnar crystals, and the solid–liquid interface shows slightly concave morphology. The equilibrium solute partition coefficient (k0), effective solute partition coefficient (ke) and solution diffusion coefficient (D) are calculated to be 0.74, 0.76 and 1.04×10−9m2/s, respectively. In the steady growth stage, the composition distribution of the FeGa rod is uniform with average level about 18.50at% Ga, which is close to the nominal composition. The deviation of the 〈001〉 orientation from the axial direction evolves from about 8° to 3° along the growth direction, and the corresponding magnetostriction increases from the initial 180ppm to the final 305ppm.
DOI: 10.1016/j.actamat.2008.05.011
发表时间: 2008-09
期刊: Acta Materialia
影响因子: 9.4
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DOI: 10.4028/www.scientific.net/msf.561-565.1117
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