Improved efficiency for preparing hard magnetic Sm2Fe17NX powders by plasma assisted ball milling followed by nitriding

•The technology is employed for the preparation of Sm2Fe17NX for the first time.•The Sm2Fe17 powder can be partially nitride by plasma assisted ball milling.•The precipitation of soft magnetic of Sm2Fe17 can be effectively inhibited.•Plasma field can increase the initial free energy of Sm2Fe17 powde...

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