Abstract
We report the dependent Cu/Ga segregation on annealing for Nd-Fe-Cu-Ga-B sintered magnets. Cu enrichment in Nd-rich grain boundary phase (GBP) improves its wettability and non-ferromagnetism with Fe consumption by forming Ga-rich Nd6Fe13Ga phase. Intergranular chemical heterogeneity induced by high-temperature dehydrogenation accelerates the formation of Nd6Fe13Ga and Cu/Ga segregation, which interprets the rapid coercivity increment to 17.6kOe with maintained remanence (13.7kG) after 480°C annealing for merely 0.5h. Higher-temperature annealing for longer duration generates large Nd6Fe13Ga at the sacrifice of continuous GBP, deteriorating the coercivity. Above correlation between evolutionary GBP and Cu/Ga segregation heralds a promising strategy towards high-coercivity permanent magnets.
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