The effect of partial substitution of Gd, Dy and Sm for Nd in Nd_60-xRE_xFe₃₀Al₁₀ alloys for the magnetic properties and microstructure was studied. Each of the elements used has different influence on the magnetic properties of the (Nd, RE)-Fe-Al alloys. Gd substantially increases the coercivity, even at as high concentrations as 20%. Addition of Gd does not change neither the initial magnetization curve nor the initial susceptibility. Similarly high coercivity increase can be achieved by addition of up to 5% of Dy. For higher Dy contents a dramatic drop of the coercivity was observed. Introduction of Sm leads to deterioration of the magnetic properties, even at as small concentrations as 1%. All the additional elements studied decrease the saturation magnetization and remanence. Additions of  Dy, Gd and Sm, which partly substitute Nd in the Nd₆₀Fe₃₀Al₁₀ alloy, leads to formation of crystalline precipitates. In the case of Dy these precipitates are formed by MgCu₂ type phase. In the Sm doped alloy the size of the crystalline precipitates, visible in the amorphous matrix, are about twice of those, which are present in the dopant free alloy.

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