Making method for rare earth sintered magnet

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A strip cast alloy containing Nd in excess of the stoichiometry of Nd 2 Fe 14 B is subjected to HDDR treatment and diffusion treatment, yielding microcrystalline alloy powder in which major phase crystal grains with a size of 0.1-1 µm are surrounded by Nd-rich grain boundary phase with a width of 2-10 nm.