Effects of Precipitate Element Addition on Microstructure and Magnetic Properties in Magnetostrictive Fe₈₃Ga₁₇ alloy

Jiheng Li; Chao Yuan; Wenlan Zhang; Xiaoqian Bao; Xuexu Gao

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자료유형: 학술저널

저자정보: Jiheng Li (University of Science and Technology Beijing) Chao Yuan (University of Science and Technology Beijing) Wenlan Zhang (University of Science and Technology Beijing) Xiaoqian Bao (University of Science and Technology Beijing) Xuexu Gao (University of Science and Technology Beijing)

저널정보: 한국자기학회 Journal of Magnetics Journal of Magnetics Vol.21 No.1

발행연도: 2016.3

수록면: 12 - 19 (8page)

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The 〈100〉 oriented Fe83Ga17 alloys with various contents of NbC or B were prepared by directionally solidification method at the growth rate of 720 ㎜·h−1. With a small amount of precipitates, the columnar grains grew with cellular mode during directional solidification process, while like-dendrite mode of grains growth was observed in the alloys with higher contents of 0.5 at% due to the dragging effect of precipitates on the boundaries. The NbC precipitates disperse both inside grains and along the boundaries of Fe83Ga17 alloys with NbC addition, and the Fe₂B secondary phase particles preferentially distribute along the grain boundaries in B-doped alloys. Precipitates could affect grain growth and improved the 〈100〉 orientation during directional solidification process. Small amount of precipitate element addition slightly increased the magnetostrictive strain, and a high value of 335 ppm under pre-stress of 15 ㎫ was achieved in the alloys with 0.1 at% NbC. Despite the fact that the effect on magnetic induction density of small amount of precipitates could be negligible, the coercivity markedly increased with addition of precipitate element for Fe83Ga17 alloy due to the retarded domain motion resulted by precipitates.

#magnetostriction #Fe-Ga alloy #niobium carbide #boron #microstructure #magnetic property

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참고문헌 신청

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