Self-organized rod-like nanostructure in Pr2Fe14B-type alloy and its role in inducing texture during the early stages of disproportionation

Anisotropic Pr13Fe80B7 magnetic powders with a maximum energy product of 216 kJ m–3 were prepared through an optimized hydrogenation disproportionation desorption recombination process. The disproportionated products display a rod-like microstructure with self-organized hexagonal PrH2 nanorods embedded in Fe matrix. B element appears between the highly ordered rod-like regions. Both the highly ordered rod-like structure and the specific distribution of B in the disproportionated microstructure are responsible for the high degree of texture orientation in the powders.

► Anisotropic HDDR PrFeB powders with a record-high energy product are prepared. ► Self-organized PrH2 nanorods embed in Fe in disproportionated products. ► B element appears between rod-like regions. ► The rod-like structure and distribution of B lead to the texture of powders.