Nanocrystalline FeNbVB Powder Prepared by Mechanical Alloying

Nanocrystalline Fe84Nb3V4B9 powders were prepared by mechanical alloying.The morphology,structure and thermal stability were studied by SEM observation,XRD analysis and heat treatment.The average grain size of α-Fe phase in Fe84Nb3V4B9 powders milled for 96h was about 10 nm.The nanocrystals exhibited good thermostability,and grew slowly during low-temperature annealing at 100-350℃.The V addition could improve powder uniformity,refine crystals,promote alloying process and enhance thermal stability of the alloy phase,suggesting that the replacement of V for Nb is beneficial to development of FeMB nanocrystalline soft magnetic materials.