ANNEALING EFFECT ON COERCIVITY AND MICROHARDNESS IN SINTERED (Nd, Tb)15(Fe, Co, Al)78B7 MAGNETS-Reference-Cited by-同舟云学术

ANNEALING EFFECT ON COERCIVITY AND MICROHARDNESS IN SINTERED (Nd, Tb)15(Fe, Co, Al)78B7 MAGNETS

Published:1999-08-20 Issue:19 Volume:13 Page:681-687
ISSN:0217-9849
Container-title:Modern Physics Letters B
language:en
Short-container-title:Mod. Phys. Lett. B

Author:

LUKIN A. A.¹,SZYMURA S.²³,ZHURAVLYEV A. A.⁴,MARGARYAN M. C.⁴,NOWY-WIECHUŁA W.³

Affiliation:

1. Centre of Magnetic Technologies, 117296 Moscow, Russia

2. Department of Physics, Technical University of Opole, PL-45-370 Opole, Poland

3. Institute of Physics, University of Opole, PL-45-052 Opole, Poland

4. Moscow Polymetal Plant, 115409 Moscow, Russia

Abstract

The variation of the coercivity and microhardness with annealing (475–1150°C/3.6 ks) of sintered (Nd, Tb) 15 (Fe, Co, Al) 78 B 7 permanent magnet have been investigated. The data indicate that the coercivity reaches the mininum and the maximum at 600°C and 775°C, respectively. Optical and scanning electron microscopy and magnetic domain structure observations give no hints to any change in microstructure. Fitting of the Mössbauer spectra of permanent magnets for different coercivity ( i H c ) values revealed that magnetic hyperfine fields (B Hf ) on all Fe sites are reduced with the increase in i H c value and the higher value of the i H c corresponds to the higher value of the Mössbauer line width. The microhardness changes in the matrix Nd 2 Fe 14 B phase have been correlated with changes in the coercivity.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

Link

https://www.worldscientific.com/doi/pdf/10.1142/S0217984999000853

Reference11 articles.

1. Thermal ageing and coercivity of sintered NdFeB magnets

2. Ageing effects in Nd(Dy)Fe(Nb)B alloys and magnets

3. Additional ferromagnetic phases in the FeNdB system and the effect of a 600°C annealing