Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Effects of Precipitate Element Addition on Microstructure and Magnetic Properties in Magnetostrictive Fe83Ga17 alloy

  • Li, Jiheng (State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing) ;
  • Yuan, Chao (State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing) ;
  • Zhang, Wenlan (State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing) ;
  • Bao, Xiaoqian (State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing) ;
  • Gao, Xuexu (State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing)
  • Received : 2015.10.20
  • Accepted : 2016.03.09
  • Published : 2016.03.31
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Abstract

The <100> oriented $Fe_{83}Ga_{17}$ alloys with various contents of NbC or B were prepared by directionally solidification method at the growth rate of $720mm{\cdot}h^{-1}$. 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 $Fe_{83}Ga_{17}$ 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 MPa 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 $Fe_{83}Ga_{17}$ alloy due to the retarded domain motion resulted by precipitates.

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References

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