Die-upset Nd11.5Fe72.4Co9Nb1B6.1 magnets with additions of Zn, Al and Sn

Ma, Yi; Liu, Ying; Li, Jun; Li, Chaoying; Chu, Liusheng

doi:10.1016/j.jmmm.2010.02.049

Cited by 19 publications

(4 citation statements)

References 7 publications

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“…4(a), the elements of Nd, Fe and Zn enriched at the particle interface. From previous studies, it is known that Zn powder can react with Nd-Fe-B in hot-pressing process to generate some new phases, such as Nd-Fe, Zn-Fe and α-Fe [10,11]. Therefore, according to the EDS results the white area is Nd-rich phase and the dark grey area is Zn, Fe-rich phases at the particle interface.…”

Section: Resultsmentioning

confidence: 99%

“…During hot-deformation, the powder particles can be elongated perpendicular to the pressure direction and these new phases at the interface can diffuse further to get more uniform distribution. Moreover, some new phases with low-melting point such as Nd-rich and Zn can diffuse further into the interior of the particles by liquid phase diffusion since the hot-deformation temperature is more than 800 ℃, which can favor the formation of c-axis texture and increasing the decoupling effect between the hard magnetic phase [10,11]. Thus, the magnetic properties of HD samples are improved largely with increasing deformation.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous works, the anisotropic Nd-lean Nd-Fe-B magnets could be obtained by the addition of Zn powder combined with hot-deformation technology [10]. Moreover, the effects of adding Zn and other elements on the magnetic properties were also studied [11,12]. However, the effect of deformation on the anisotropy and properties of magnets and the mechanism of c-axis texture still needs further study.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Anisotropic Nd-Lean Nd-Fe-B Magnets with Improved Coercivity

Long

Yin

et al. 2017

MSF

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Anisotropic bulk nanocrystal Nd-lean Nd-Fe-B magnets were prepared by hot-pressing the mixture of Nd11.5Fe81.5Nb1B6 melt-spun ribbons and pure Zn powder and subsequent hot-deforming. The effects of deformation on the magnetic properties and microstructure were also studied. The magnetic properties increased significantly for hot-deformed (HD) samples due to the formation of good c-axis texture with increasing deformation. The remanence Mr and maximal energy product (BH)m increased and reached their maximal values at 65% deformation due to the increasing orientation. On the other hand, the grains increased and were elongated normal to the press direction gradually with increasing deformation. The variation trend was similar to that of traditional Nd-Fe-B magnets. However, there was an obvious improvement for coercivity in the initial stage of hot-deformation resulting from the adequate Zn diffusion into grain-boundary. When the deformation was larger than 65%, the magnetic properties were deteriorated due to abnormal grain growth. In order to improve further the coercivity Hci, the samples with Dy addition were prepared. The coercivity of 12300 Oe could be obtained for anisotropic bulk Nd9.5Dy2Fe81.5Nb1B6.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of Anisotropic Nd-Lean Nd-Fe-B Magnets with Improved Coercivity

Long

Yin

et al. 2017

MSF

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“…Hot-press (HP) and Hot-deformation (HD) had been proved as efficient methods to produce Nd-Fe-B magnets with advantages of simple preparation process, high density, low cost, good thermal ability and magnet anisotropy. So far, the maximum reported coercivity of HD Nd-Fe-B magnets has reached 1.91 T [3,4]. However, it is still a great challenge to obtain high-performance nanocomposite alloys with strong c-axis orientation by hot-deformation, since there is not enough RE-rich phase accelerating the development of c-axis alignment [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effects of Co, Zr Additions on the Magnetic Properties of Nanocomposite Nd<sub>2</sub>Fe<sub>14</sub>B/α-Fe Magnets

Long

et al. 2017

MSF

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The effects of the additions of Co, Zr on microstructure and magnetic properties were studied for hot-deformed (HD) nanocomposite Nd11.5Fe81.5-xNb1CoxB6 (x=0, 2, 4, 8) and Nd11.5Fe82.5-xZrxB6 (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 (Hci) and maximum energy product ((BH)m) of HD alloys increased firstly, and then decreased with further increasing Co content. The maximum (BH)m of 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 Nd11.5Fe81.5Zr1B6 magnet with 1.5 wt.% Zn addition showed enhanced properties with Hci of 7100 Oe and remanent magnetization (Mr) 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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