High coercivity in Nd-Fe-Al-Co-B alloys prepared by mechanical milling

Nd40Fe30Al10Co15B5 alloys were fabricated by high energy ball milling method under various conditions. Microstructure of the alloys was investigated by X-ray diffraction and electron microscopy techniques. Magnetic properties were characterized by hysteresis and thermomagnetic measurements. The high coercive fields up to 2.36 T have been observed on the samples consisting of Nd2(Fe,Co,Al)14B, Nd6(Fe,Co,Al)14 and Nd crystallites imbedded in a residual amorphous matrix.