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Effect of Cu and Al Substitutions on the Microstructure of R-Fe-B Magnets

  • Y. J. Zhang (a1), L. Withanawasam (a1), G. C. Hadjipanayis (a1) and A. Kim (a2)

Abstract

The coercivity of melt-spun Pr-Fe-B ribbons was found to increase with the addition of Cu and Al. The change in size and shape of grains with Cu and Al substitution were investigated by transmission eletron microscopy (TEM) and the grain boundary structure was further examined with high resolution electron microscopy (HREM). For small substitutions only “disturbed lattice” regions were observed at most of the grain boundaries. Secondary phases rich in the added elements were observed mostly at tripple grain boundaries and sometimes at grain boundaries in samples with larger amounts of substitution. The grain size in the substituted samples does not decrease much with further substitution. However, the shape of grains changes from polyhexagons to facets. The enhancement in coercivity can be explained by the grain size reduction and the modification of microstructure at the grain boundary regions.

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Effect of Cu and Al Substitutions on the Microstructure of R-Fe-B Magnets

  • Y. J. Zhang (a1), L. Withanawasam (a1), G. C. Hadjipanayis (a1) and A. Kim (a2)

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