Coercivity improvement in Nd–Cu infiltrated Nd-Fe-B hot-deformed magnets by controlling microstructure of initial HDDR powders

We have studied influence of the microstructure of initial hydrogenation-disproportionation-desorption-recombination (HDDR) treated isotropic powders on the magnetic and microstructural properties of Nd–Cu infiltrated Nd-Fe-B hot-deformed magnets. To control the microstructure of the initial HDDR powders, the starting strip-cast alloys were heat-treated prior to the HDDR process (HDDR powder A). Compared to the HDDR powders prepared from the...