Abstract
A comprehensive study on the effect of various substitutions of M on the magnetic and structural properties of melt-spun nanocomposite Pr 8Fe 84M 2B 6 (M=Cr, Nb, Ti and Zr) magnets has been performed with the aim of refining the microstructure and therefore enhancing the hard magnetic properties. It has been found that magnetic properties are improved by all the substitutions. The largest enhancement is obtained in Nb substituted Pr 8Fe 84Nb 2B 6 magnets where a coercivity of 6.5 kOe and a maximum energy product of 17.9 MGOe have been obtained, as compared to the coercivity of 4.3 kOe and the energy product of 9.1 MGOe in the Pr 8Fe 86B 6 magnet. Microstructure studies revealed a finer and more uniform 2:14:1/α-Fe nanoscale microstructure with M substitutions. The most uniform microstructure with the smallest average grain size of 10–20 nm is developed in the Nb substituted magnets. The enhancement of magnetic properties by M substitution is believed to be due to the microstructure refinement which leads to an enhanced exchange coupling between Pr 2Fe 14B and α-Fe.
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