Transmission electron microscopy has been employed to characterise the physical and magnetic microstructure of a HDDR processed homogenised Nd12.8Fe69.2Co11Ga1B6 alloy. In addition, the microstructural development during the different stages has been studied by scanning electron microscopy. The disproportionated mixture consists of NdH2+/-x rods embedded in an alpha-(Fe, Co) matrix, very similar in appearance to that of the ternary alloy. The grain size in the recombined material was found to be in the range of 200-800nm. Continuous domains could be observed in thin sections of the alloy over significantly larger areas than that of the submicron grains. In the case of smaller grains, it was observed that the domain walls follow the grain boundaries, whereas in relatively larger grains it could be seen that the walls frequently cut through the grains.
|Title of host publication
|Rare-Earth Magnets and their Applications, Vols 1 and 2 - Proceedings of the 14th International Workshop
|World Scientific Publishing
|Number of pages
|Published - 1996