Role of lanthanum in microstructure evolution and enhanced magnetic properties of cerium‐containing sintered magnets. Issue 11 (10th November 2020)

• Record Type: Journal Article
• Authors: Wei, Z.; Ying, L.; Jun, L.; Lele, L.; Xi, G.
• Is Part Of: Materialwissenschaft und Werkstofftechnik. Volume 51:Issue 11(2020:Nov.)
• Page Start: 1561
• Page End: 1568
• Publication Date: 2020-11-10
• Subjects: Ce/La−Fe−B alloy -- phase constitution -- microstructure -- cerium-content -- sintered magnets -- magnetic properties; Ce/LaFeB-Legierung -- Phasenbildung -- Gefüge -- Cer-Gehalt -- gesinterter Magnet -- magnetische Eigenschaften; Materials -- Periodicals; Materials -- Testing -- Periodicals; 620.1
• DOI: 10.1002/mawe.202000021
• Languages: English
• ISSNs: 0933-5137

Abstract

Abstract: In this study, lanthanum was applied to strip cast Ce−Fe−B alloy to improve its phase composition and microstructure. The results reveal that lanthanum doping can significantly enhance the proportion of 2 : 14 : 1 phase and improve the microstructure of Ce−Fe−B alloy. Besides, the influence of the starting alloys structure on the microstructure and magnetic properties of final multi‐phases cerium‐containing magnets was also systematically investigated. Compared to the multi‐phases magnet without lanthanum addition, a pronounced coercivity increment could be distinguished in lanthanum‐doping multi‐phases magnet, which could be attributed to the finer grain size together with ideal grain boundary. In this work, the superior performance of H cj = 701.28 kA/m B r = 1.30 T, and ( BH )max = 313.70 kJ/m 3 were obtained by blending Nd−Fe−B alloy with (La0.35 Ce0.65 )‐Fe−B alloy to meet 25.0 wt.% lanthanum‐cerium utilization content, suggesting that the possibility to develop high abundant rare earth permanent magnetic materials. Abstract : The high abundance La was introduced into RE−Fe−B magnets for the balanced utilization of rare earth. The introduction of La could promote the formation of 2 : 14 : 1 phase (∼93.8 %) and improve the microstructure (column crystals) in Ce−Fe−B alloy. Surprisingly, the significant coercivity enhancement (554.02 kA/m→701.28 kA/m) and nearly remains unchanged remanence were found in La‐doping magnets.