Phase composition, structure and magnetic behaviour of low neodymium rapid-quenched Nd–Fe–B alloys

Ćosović, Vladan; Žák, T.; Talijan, N.; Grujić, Aleksandar; Stajić-Trošić, Jasna

doi:10.1016/j.jallcom.2007.02.018

Cited by 7 publications

(8 citation statements)

References 12 publications

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“…Composed of Nd 2 Fe 14 B, Fe 3 B and α-Fe phases, the alloy in the optimized magnetic state has mainly a nanocomposite structure. The value of the remanent ratio J r /J s > 0.5, calculated from the SQUID hysteresis loops [3], suggests that exchange coupling interactions between grains of the soft and hard magnetic phase exist. This assumption is supported by the higher value of the remanence and (BH) max , which are typical of nano-composite structures of Nd-Fe-B alloys.…”

Section: Resultsmentioning

confidence: 97%

“…The amount of the hard and soft magnetic phases and their crystallite sizes, calculated by Full-Prof quantitative phase analysis and size-strain analysis of the XRD data are presented in Table. In the optimised state of the alloy, Fe 3 B, Nd 2 Fe 14 B, Fe 77.2 Nd 22.8 and α-Fe phases were identified by XRD analysis. It also suggests that the presence of Nd 2 Fe 23 B 3 and α-Fe could not be neglected [3,4]. The presence of a Fe 77.2 Nd 22.8 phase is to be understood more as a representative of Fe(Nd,B) components.…”

Section: Resultsmentioning

confidence: 99%

“…The microstructure of the alloy in the optimized state was observed by transmission electron microscopy (TEM). Magnetic properties before and after TM were measured previously using SQUID magnetometer with a magnetic field strength of 50 kOe [3].…”

Section: Methodsmentioning

confidence: 99%

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Thermomagnetic Behaviour and Microstructure of a Rapidly Quenched Nd_4.5Fe₇₇B_18.5Alloy

et al. 2008

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Changes in the phase composition and crystallite size, as well as changes in the magnetic behaviour of Nd 4.5 Fe 77 B 18.5 alloy, caused by thermomagnetic measurements, was observed in regard of the optimal magnetic state of this alloy. In the optimized magnetic state, the formed nanocomposite consisted of Fe3B/Nd2Fe14B and partly of α-Fe with a mean crystallite size < 30 nm, as determined by X-ray diffraction and transmission electron microscopy. An increased amount of α-Fe, the presence of Nd 2 O 3 and different Fe-B phases, as well as an increase in the mean crystallite size were observed after thermomagnetic measurements had caused a quality loss of the hard magnetic properties.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Thermomagnetic Behaviour and Microstructure of a Rapidly Quenched Nd_4.5Fe₇₇B_18.5Alloy

et al. 2008

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“…1), is to be understood more as a representative of Fe(Nd,B) and Fe(B) components, which most likely have origin on surfaces and/or interfaces of fine grains of individual phases, as determined by 57 Fe Mössbauer spectroscopic analysis published in Ref. 5). On the presented XRD spectra (Fig.…”

Section: Resultsmentioning

confidence: 99%

Thermomagnetic Analysis of Nanocrystalline Nd4.5Fe77B18.5 Alloy

et al. 2009

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Changes in the phase composition and crystallite size of a rapid quenched Nd 4:5 Fe 77 B 18:5 alloy, caused by thermomagnetic measurements (TM) have been studied using XRD methods of phase analysis, crystallite size and lattice microstrain determination. Structural changes in regard to optimal magnetic state were additionally analyzed by TEM. Magnetic properties in optimal magnetic state and after TM were observed using room temperature SQUID measurements. The obtained experimental results suggest the Fe 3 B/Nd 2 Fe 14 B and partly -Fe nanocomposite structure of the alloy in the optimized magnetic state, with mean crystallite size (< 30 nm). After TM, an increased amount of -Fe phase, presence of different oxide and Fe-B phases as well as growth of crystallites are found to be the main reasons for the observed quality loss of hard magnetic properties.

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“…The particles of the powder have characteristic (859) angular shape with mean size of 87 µm. Used magnetic powder was fairly characterized in previous investigations [11][12][13] and its magnetic properties measured on a vibrating sample magnetometer after subsequent annealing at 660…”

Section: Methodsmentioning

confidence: 99%

Polymer - Bonded Magnetic Materials with Various Nd-Fe-B Filler Content

et al. 2010

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One of the more important developments in magnetic materials, polymer bonded magnets, have opened a new world of application opportunities. The Nd-Fe-B/polymer composite materials offer an excellent combination of strong magnetic and dynamical-mechanical properties. However, the transition temperatures of filler and matrix should be selected carefully considering the future application. Uniform particle distribution and good adhesion between Nd-Fe-B powder particles and polymer are essential for the quality of the composite, while stiffness of polymer matrix is one of the influencing factors as well. The damping properties of Nd-Fe-B/polymer composites with 15 wt.%, 50 wt.% and 75 wt.% of Nd-Fe-B powder were studied by dynamic mechanical analysis and compared with a pure polymer sample. Thermal stability was analyzed using a simultaneous differential scanning calorimetric and thermogravimetric analysis technique.

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Phase composition, structure and magnetic behaviour of low neodymium rapid-quenched Nd–Fe–B alloys

Cited by 7 publications

References 12 publications

Thermomagnetic Behaviour and Microstructure of a Rapidly Quenched Nd_4.5Fe₇₇B_18.5Alloy

Thermomagnetic Behaviour and Microstructure of a Rapidly Quenched Nd_4.5Fe₇₇B_18.5Alloy

Thermomagnetic Analysis of Nanocrystalline Nd<SUB>4.5</SUB>Fe<SUB>77</SUB>B<SUB>18.5</SUB> Alloy

Polymer - Bonded Magnetic Materials with Various Nd-Fe-B Filler Content

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Phase composition, structure and magnetic behaviour of low neodymium rapid-quenched Nd–Fe–B alloys

Cited by 7 publications

References 12 publications

Thermomagnetic Behaviour and Microstructure of a Rapidly Quenched Nd4.5Fe77B18.5Alloy

Thermomagnetic Behaviour and Microstructure of a Rapidly Quenched Nd4.5Fe77B18.5Alloy

Thermomagnetic Analysis of Nanocrystalline Nd<SUB>4.5</SUB>Fe<SUB>77</SUB>B<SUB>18.5</SUB> Alloy

Polymer - Bonded Magnetic Materials with Various Nd-Fe-B Filler Content

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Product

Resources

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Thermomagnetic Behaviour and Microstructure of a Rapidly Quenched Nd_4.5Fe₇₇B_18.5Alloy

Thermomagnetic Behaviour and Microstructure of a Rapidly Quenched Nd_4.5Fe₇₇B_18.5Alloy