Synthesis of Tb_0.3Dy_0.7Fe_1.9 magnetostrictive alloy by unidirectional solidification in magnetic field and microgravity

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• 作者：Minagawa ; Hideki ; Kamada ; Keiji ; Nagai ; Hideaki ; Nakata ; Yoshinori ; Okutani ; Takeshi
• 关键词：Terfenol-D ; Magnetostrictive material ; Unidirectional solidification ; Microgravity ; Magnetic field
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2002
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：July, 2002
• 卷：248
• 期：2
• 页码：230-235
• 文件大小：231 K

摘要

We performed unidirectional solidification experiments on magnetostrictive materials of Tb_0.3Dy_0.7Fe_2−x, (Terfenol-D) alloy in a static magnetic field from 0 to 0.1T and microgravity of 10⁻⁴g for 10s. When the magnetic field strength was increased from 0 to 3.7×10⁻²T during unidirectional solidification in microgravity, a [111] crystallographic alignment of the grains dominated, and the maximum magnetostriction increased from 500 to 2000ppm. However, when a magnetic field above 3.7×10⁻²T was applied during solidification, magnetostriction decreased to 1000ppm because cracks were formed. For comparison, unidirectional solidification under field of 3.7×10⁻²T in normal gravity yields a maximum magnetostriction of 1000ppm.