Magnetic hardening of melt-spun nanocomposite Nd2Fe14B/Fe magnets (Journal article)

Panagiotopoulos, I./ Withanawasam, L./ Murthy, A. S./ Hadjipanayis, G. C./ Singleton, E. W./ Sellmyer, D. J.


Coercivity optimization studies were done on melt-spun nanocomposite Nd(4)R(2)Fe(87-x)NbT(x)B(6) (R=Nd,Y,Dy; T=Ag,Cu) isotropic ribbon samples. The maximum attainable coercivities, after adjusting the annealing time, were found to be very sensitive to the annealing temperatures. The optimum magnetic properties [H-c=3.9 kOe, (BH)(max)=10 MGOe] were obtained by annealing at 750-775 degrees C for a few minutes. Optimization by flash annealing gave similar results. Microstructural studies show that the grain size is greater than the theoretically predicted grain size for optimum coupling between the hard and the soft phase. With the annealing conditions used, Nd4Dy2Fe87NbB6 samples gave moderate coercivities and in Nd4Y2Fe87NbB6 samples the coercivity was reduced more than the expected reduction in the anisotropy field due to the presence of Y. (C) 1996 American institute of Physics.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών
Keywords: permanent-magnets
URI: http://olympias.lib.uoi.gr/jspui/handle/123456789/14134
ISSN: 0021-8979
Link: <Go to ISI>://A1996UG87700127
Publisher: American Institute of Physics
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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