Large magnetostriction in directionally solidified FeGa and FeGaAl alloys
Large magnetostriction in directionally solidified FeGa and FeGaAl alloys
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DOI：
10.1063/1.1412840
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发表时间：
2001-12-01
影响因子：
3.2
通讯作者：
Guruswamy, S
中科院分区：
文献类型：
--
作者：
Srisukhumbowornchai, N;Guruswamy, S
研究了Fe-x的磁致伸缩特性。% Ga（x=15，20，和27.5）进行了测量，在不同的定向凝固条件下处理的合金，和部分取代Ga与Al对合金的磁致伸缩的效果进行了检查。磁致伸缩测量进行了不同的预应力水平从0到55 MPa。Ga添加量在15- 27.5at. % Ga的Fe中被发现提高Fe的无序bcc相的磁致伸缩多达1个数量级。饱和磁致伸缩和观察到的磁滞所施加的领域是小的。多晶Fe-27.5at.的磁致伸缩值高达271 × 10 ~（-6）。%的Ga棒，使用定向生长（DG）工艺以22.5mm/h的生长速率制备。该工艺实质上是一种无籽晶垂直布里奇曼技术，产生了近[001]织构的多晶Fe-Ga合金。DG合金的优选[001]晶体取向与棒方向偏离约14度。Ga含量在15 ~ 27.5at. %时，Ga增加了无序bcc（A2）相的Fe-Fe间距，降低了Fe的磁矩。Al替代Ga对Fe-Ga合金的磁致伸缩性能有显著影响。5的小替换。%的Al对于Fe-20 at. % Ga合金使Fe中的磁致伸缩增大，其值略大于Fe-20 at. % Ga合金。较高的Al取代量倾向于降低磁致伸缩。(C)2001年美国物理学会。
The magnetostriction of Fe-x at. % Ga (x=15, 20, and 27.5) was measured, for alloys processed under different directional solidification conditions, and the effect of partial substitution of Ga with Al on the magnetostriction of the alloys was examined. Magnetostriction measurements were carried out at different prestress levels varying from 0 to 55 MPa. Ga additions in the range of 15-27.5 at. % Ga in Fe were found to improve the magnetostriction of the disordered bcc phase of Fe by as much as 1 order of magnitude. The applied fields for saturation magnetostriction and the hysteresis observed were small. Magnetostriction values as high as 271x10(-6) were obtained in polycrystalline Fe-27.5 at. % Ga rods prepared using a directional growth (DG) process at a growth rate of 22.5 mm/h. This process, which is essentially a seedless vertical Bridgman technique, resulted in near [001] textured polycrystalline Fe-Ga alloys. The preferred [001] crystallographic orientation of the DG alloys was approximately 14 degrees away from the rod direction. For Ga contents between 15 and 27.5 at. % in Fe, the Ga atoms increase the Fe-Fe spacing in the disordered bcc (A2) phase and reduce the magnetic moment of Fe. Substitution of Ga with Al has a significant effect on the magnetostriction of the Fe-Ga alloys. Small substitution of 5 at. % Al for Ga in the Fe-20 at. % Ga alloy increases the magnetostriction in Fe, and the value is slightly larger than that of the Fe-20 at. % Ga alloy. A higher substitution amount of Al tends to decrease the magnetostriction. (C) 2001 American Institute of Physics.