The Effect of Annealing in a Magnetic Field on the Microstructures and Magnetic Properties of (Nd<sub>0.8</sub>RE<sub>0.2</sub>)<sub>2.2</sub>Fe<sub>12</sub>Co<sub>2</sub>B (RE = La, Ce) Alloys

The Effect of Annealing in a Magnetic Field on the Microstructures and Magnetic Properties of (Nd<sub>0.8</sub>RE<sub>0.2</sub>)<sub>2.2</sub>Fe<sub>12</sub>Co<sub>2</sub>B (RE = La, Ce) Alloys

The development of high-performance and cost-effective Nd-Fe-B permanent magnets is crucial to meet the ever-growing requirements of renewable and clean energy applications. Here, we use low-cost and highly abundant La and Ce to partially substitute Nd and investigate the effect of annealing treatme...

Full description

Saved in:
Bibliographic Details
Main Authors: Xiaohua Tan, Xuanbo Shi, Shiqi Zhang, Hui Xu
Format: Article
Language:English
Published: MDPI AG 2024-12-01
Series:Metals
Subjects:
rare-earth permanent alloy
magnetic field annealing
magnetic property
intergranular phase
Online Access:https://www.mdpi.com/2075-4701/15/1/5
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The development of high-performance and cost-effective Nd-Fe-B permanent magnets is crucial to meet the ever-growing requirements of renewable and clean energy applications. Here, we use low-cost and highly abundant La and Ce to partially substitute Nd and investigate the effect of annealing treatment with a 1 tesla (T) magnetic field on the microstructures and magnetic properties of (Nd<sub>0.8</sub>RE<sub>0.2</sub>)<sub>2.2</sub>Fe<sub>12</sub>Co<sub>2</sub>B (RE = La, Ce) ribbons. The remanence (B<sub>r</sub>) and maximum energy product ((BH)<sub>max</sub>) of studied alloys can be improved by magnetic field annealing. The respective B<sub>r</sub> and (BH)<sub>max</sub> of annealed (Nd<sub>0.8</sub>La<sub>0.2</sub>)<sub>2.2</sub>Fe<sub>12</sub>Co<sub>2</sub>B alloy are increased to 0.86 T and 124 kJ/m<sup>3</sup>. In comparison to melt-spun (Nd<sub>0.8</sub>Ce<sub>0.2</sub>)<sub>2.2</sub>Fe<sub>12</sub>Co<sub>2</sub>B alloy, the B<sub>r</sub> and (BH)<sub>max</sub> of the magnetic field-annealed alloy are improved by 5% and 8%. The underlying mechanism of improved magnetic properties of La- and Ce-substituted alloys is different. The interaction magnetic domain size in (Nd<sub>0.8</sub>La<sub>0.2</sub>)<sub>2.2</sub>Fe<sub>12</sub>Co<sub>2</sub>B alloy can be increased by magnetic field annealing, leading to the enhancement of exchange coupling interaction, which results to the improvement in B<sub>r</sub> and (BH)<sub>max</sub>. In the (Nd<sub>0.8</sub>Ce<sub>0.2</sub>)<sub>2.2</sub>Fe<sub>12</sub>Co<sub>2</sub>B alloy, the concentration of (Fe + Co) of ferromagnetic intergranular phase is increased after magnetic field annealing, resulting in the increase in B<sub>r</sub> and (BH)<sub>max</sub>.
ISSN:2075-4701

Similar Items