Abstract: The effect of a partial substitution of Zr, Ga, Co and Ga, Co, Ga and Zr, respectively for Fe on the structure and magnetic properties of Nd8.4Fe87.1B4.5 alloy prepared by mechanical alloying has been studied in detail. It has been shown that, intrinsic coercivity mu(o)H(c), and maximum magnetic energy product (BH)(max) increase for only Zr or Ga-containing samples, which is mainly due to the refinement of soft grains. The combined addition of Co and Ga is less effective for improving mu(o)H(c) and (BH)(max) than the respective addition of Co or Ga, which may be due to the formation of CsCl-type CoGa. mu(o)H(c) and (BH)(max) for combined Co, Ga, Zr-added alloy are higher than those for the combined Co, Ga-added alloy but lower than those for only Zr-containing alloy.

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