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Vol.41, No.7, 411 ~ 419, 2003
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| Title |
| Loss of Rare Earth Element and Macrosegregation Behavior in Czochralski growth of Terfenol-D |
| 김종철 Kim Jong Chul , 박원제 Park Won Je , 이진형 Lee Zin Hyoung , 예병준 Ye Byung Joon |
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| Abstract |
| Giant magnetostrictive material Terfenol-D was grown by Czochralski method in various melt temperature under purified argon at 1.2 atm and the macrosegregation of RE along growth direction was investigated. It can be expected that concentration of RE elements follow the Burton-Prim-Slicter relation in Czochralaki system. However, the aspects of macrosegregation were changed with melt temperature: At lower melting temperature, RE elements concentration increased slong growth direction, while at higher, it decreased. This was due to the change of melt composition during growth caused by loss of RE. Therefore, we discussed the reaction of RE with crucible and evaporation through free surface, which are the main reasons of RE loss. In addition, the macrosegregation was discussed considering the loss of RE with melt temperature. |
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| Key Words |
| Terfenol-D, Magnetostrictive material, Czochralski, Macrosegregation |
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