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RESEARCH PRODUCT
ANNEALING EFFECT ON COERCIVITY AND MICROHARDNESS IN SINTERED (Nd, Tb)15(Fe, Co, Al)78B7 MAGNETS
A. A. LukinW. Nowy-wiechułaA. A. ZhuravlyevM. C. MargaryanS. Szymurasubject
Materials scienceCondensed matter physicsMagnetic domainAnnealing (metallurgy)Scanning electron microscopeMagnetMössbauer spectroscopyStatistical and Nonlinear PhysicsCoercivityCondensed Matter PhysicsMicrostructureHyperfine structuredescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-08-20 | Modern Physics Letters B |