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HomeMaterials Science ForumMaterials Science Forum Vol. 898Effects of Co, Zr Additions on the Magnetic...

Effects of Co, Zr Additions on the Magnetic Properties of Nanocomposite Nd₂Fe₁₄B/α-Fe Magnets

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Abstract:

The effects of the additions of Co, Zr on microstructure and magnetic properties were studied for hot-deformed (HD) nanocomposite Nd_11.5Fe_81.5_-xNb₁Co_xB₆(x=0, 2, 4, 8) and Nd_11.5Fe_82.5_-xZr_xB₆ (x=0, 1) magnets, respectively. The remanence of hot-pressed (HP) magnets increased with increasing Co content firstly, but decreased when Co content was more than 2 at. % for HD magnets. Also the intrinsic coercivity (H_ci) and maximum energy product ((BH)_m) of HD alloys increased firstly, and then decreased with further increasing Co content. The maximum (BH)_mof 24 MGOe was obtained at 2 at.% Co addition. Zr addition can improve significantly the c-axis alignment and magnetic properties of HD nanocomposite magnets, and HD Nd_11.5Fe_81.5Zr₁B₆ magnet with 1.5 wt.% Zn addition showed enhanced properties with H_ci of 7100 Oe and remanent magnetization (M_r) of 1.06 T. The alloys have the structure of plate-like grains, but there are still many coarse grains, which may result from the un-uniform composition in the alloy.

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Periodical:

Materials Science Forum (Volume 898)

Pages:

2128-2133

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.898.2128

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Online since:

June 2017

Authors:

Bing Bing Li, Yi Long Ma*, Chun Hong Li, Xue Guo Yin, Qiang Zheng, Jian Chun Sun, Dong Ling Guo, Bin Shao, Wen Zeng

Keywords:

Hot Deformation, Magnetic Properties, Microstructure, Nanocomposite Magnets

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