발간논문

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Vol.36, No.10, 1605 ~ 1614, 1998
Title
The Study of Solidification Characteristics of Terfenol-D by Bridgman Method
김종철 , 김지훈 , 예병준 , 박원제 , 이진형 Jong Chul Kim , Ji Hun Kim , Byung Joon Ye , Won Je Park , Zin Hyoung Lee
Abstract
In this study we have conducted experiments for alloying Tb-Dy-Fe of which the target composition was Tb_(0.27)Dy_(0.73)Fe_(1.95) to achieve energy efficiency and mechanical strength. Because of the high oxidizing tendency of rare earth metals, Tb, Dy and the high vapour pressure of Dy, the charging composition had to be adjusted to Tb_(0.27)Dy_(0.73)Fe_(1.69). After alloying, Terfenol-D rods were grown in directional solidification by Bridgman technique and the solidification characteristics was investigated as function of solidification conditions. It was found that the characteristics primarily depended an the temperature gradient and the cellular-dendrite transition occurred at the growth rate around 25 ㎛/s. The morphology of dendrite was plate type and these dendrite plates displayed a strong preference of <112> alignment along growth direction. The magnetostriction measurements were performed at various pressures and magnetic fields. With 3N purity of elements, the maximum strain(λ_(max)) was increased from 887 to 1000 ppm at 7.35 MPa as the interface morphologies were changed from dendrite to cellular.
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