Effect of the first hot extrusion temperature on microstructure and magnetic properties of second-extrusion Nd2Fe14B/α-Fe nanocomposite

► Nanocomposite Nd2Fe14B/α-Fe magnets were well fabricated by two hot extrusions. ► High real density and magnetic properties were obtained in the fabricated magnets. ► First-extrusion temperature had a large effect on microstructure and properties.