Abstract
Cast alloys with a range of compositions based on Nd 15Fe 77B 8 with additions of Dy and Zr were produced by a conventional casting method. Zr was added prior to casting in the form of either zirconium or zirconia. The materials were processed using the hydrogen decrepitation, disproportionation, recombination (HDDR) technique in order to develop the fine microstructures necessary for high coercivities. Magnetic measurements on bonded samples produced from the HDDR powders indicated that additions of Zr tended not to affect the recombination temperatures at which the material began to develop high coercivity, but was clearly observed to extend the temperature range over which high coercivity material could be produced. Microstructural analysis revealed that the Zr-doped samples were less prone to the explosive grain growth exhibited by the Zr-free samples at these temperatures.
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