Effect of Magnetic Field on the Crystalline Structure of Magnetostrictive TbFe2 Alloy Solidified Unidirectionally in Microgravity
Effect of Magnetic Field on the Crystalline Structure of Magnetostrictive TbFe2 Alloy Solidified Unidirectionally in Microgravity
复制标题
磁场对微重力单向凝固磁致伸缩TbFe2合金晶体结构的影响
DOI：
10.1196/annals.1324.015
复制
发表时间：
2004
影响因子：
5.2
通讯作者：
H. Nagai
中科院分区：
文献类型：
--
作者：
T. Okutani;Y. Nakata;H. Nagai
摘要：在日本微重力中心（JAMIC） 490 m自由落体获得的10−4g静磁场下，对TbFe2合金进行了10秒的定向凝固实验。在微重力条件下，当磁场强度从0增加到4.5 × 10−2 T时，合金的晶体取向为[11 11]，最大磁致伸缩常数从1,000 ppm增加到4,000 ppm。在重力定向凝固条件下，随着磁场强度的增大，合金的最大磁致伸缩常数保持在2000 ppm。柱状结构沿着磁场生长和定向。tfe2晶体在微重力条件下的生长方向主要与磁场方向相同。
Abstract: We performed unidirectional solidification experiments on TbFe2 alloy in a static magnetic field in microgravity of 10−4g for 10 sec obtained by a 490 m free fall of the Japan microgravity center (JAMIC). When the magnetic field strength was increased from zero to 4.5 × 10−2 T during unidirectional solidification in microgravity, a [1 1 1] crystallographic alignment dominated, and the maximum magnetostriction constant increased from 1,000 ppm to 4,000 ppm. For unidirectional solidification in normal gravity, the maximum magnetostriction constant remained at 2,000 ppm with increasing magnetic field. The columnar structure grows and orients along the magnetic field. TbFe2 crystals grow in microgravity predominantly in the same direction as the magnetic field.