The Effect of Nd-Cu Addition on the Coercivity of Hot-Deformed Magnet Prepared with HDDR Powder

HDDR (hydrogenation disproportionation desorption recombination) has attracted much attention for refining grain size and recycling waste magnets. [1]-[2] However, the coercivity of deformed magnets prepared by HDDR-processed powders (HDDR magnet) are far below the expected value based on their submicron grains, which is attributed to the lack of continuous ultrathin Nd-rich intergranular phase between neighboring Nd₂Fe₁₄B matrix grains.^[3]