Abstract
The structure, microstructure and magnetic properties of Nd 2Fe 14B/α-Fe nanocomposite obtained after 8 h of high energy milling and different heat treatments are investigated. Two types of annealing have been performed: a conventional heat treatment at 550 °C for 1.5 h is used for comparison with rapid annealing for maximum 3 min at 700, 750 or 800 °C. It is found that these rapid annealing are much more efficient to promote the recrystallisation of the hard phase with a limited grain growth of the soft magnetic phase thus leading to better magnetic properties. Indeed, the best coercive field of 0.55 T was obtained for samples annealed at 700, 750 and 800 °C for 2.5, 1.5 and 1 min respectively. This behaviour is explained by both, a good recovery of crystallinity for the hard phase and relatively small size Fe nanocrystallites. The different heat treatments do not result in significant changes for remanent magnetization, which is between 93 and 107 A m 2/kg. X-ray diffraction patterns were used to follow the evolution of the structure and the microstructure. The magnetic behaviour was checked from hysteresis curves and dM/ dH vs. H plots.
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.
