Effect of annealing on the structure and magnetic properties of SmCo_5-based ribbons with Al-Cu-Fe addition

摘要

Al-Cu-Fe alloying addition can simultaneously improve the coercivity and magnetization of the as-spun SmCo5-based ribbons, the annealing process can further improve the hard-magnetic properties of ribbons. In this paper, SmCo5 + 3 wt% Al82.8Cu17Fe0.2 ribbons melt-spun at 40 m/s were annealed at 500 - 700 degrees C for 30 min. It is found the annealing improves the crystallinity of the grains, changes the phase composition and microstructure, especially the distribution of Sm(Co, M)(7) phase. By doping 3% Al82.8Cu17Fe0.2 alloy and annealing at 600 degrees C for 30 min, the SmCo5-based ribbons obtain ultra-high coercivity of 26.8 +/- 3.3 kOe. The reason for the maximum coercivity at 600 degrees C can be attributed to the high content of Sm(Co, M)(5) grains, improved crystallinity of the grains, and the refinement of the grains. (C) 2020 Elsevier B.V. All rights reserved.