Abstract
Nd2Fe14B/Fe(Co) hard/soft nanocomposite materials with selective Co substitution (for Fe in soft-phase precursors) have been prepared by mechanical-milling and vacuum annealing of Nd2Fe14B + 20 wt%Fe100−xCox (x = 0–100 at%) alloys. It was found that the structural and magnetic properties of the Nd2Fe14B/Fe(Co) nanocomposites change significantly as a function of the Co substitution content. Appropriate Co substitution content increases the volume fraction of the soft phase and refines the grain size of both the hard and soft phases. Meanwhile, the Co substitutions prefer to be alloyed with Fe atoms, including those of the Nd2Fe14B hard-phase precursors. Magnetic measurement shows that such Co substitution rises the magnetic properties of the nanocomposite products, especially the magnetization, remanence Mr, and energy product (BH)max. As a result, optimum magnetic properties with Mr = 11.7 kG, Hci = 5.5 kOe, (BH)max = 17.4 MGOe have been achieved at x = 50 at%, compared to Mr = 10.2 kG, Hci = 5.3 kOe, (BH)max = 13.0 MGOe at x = 0. The enhancement in energy product reaches a high level of 26%. Strengthened exchange coupling between the soft and hard phases has been revealed in the Co-substituted two-phase nanocomposite products. The mechanisms explaining the changes of structural and magnetic properties of the Nd2Fe14B/Fe(Co) products were discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
