The Effects of the Addition of Dy, Nb, and Ga on Microstructure and Magnetic Properties of Nd 2 Fe 14 B/ α -Fe Nanocomposite Permanent Magnetic Alloys

• Published in: Microscopy and microanalysis Vol. 23; no. 2; pp. 425 - 430
• Main Authors: Ren, Kezhi, Tan, Xiaohua, Li, Heyun, Xu, Hui, Han, Ke
• Format: Journal Article
• Language: English
• Published: 01.04.2017
• ISSN: 1431-9276; 1435-8115
• DOI: 10.1017/S1431927616012770

Abstract We study the effects of Dy, Nb, and Ga additions on the microstructure and magnetic properties of Nd 2 Fe 14 B/ α -Fe nanocomposites. Dy, Nb, and Ga additions inhibit the growth of the soft magnetic α -Fe phase. Dy and Nb additions are able to refine the microstructure, whereas Ga addition plays only a minor role in prohibiting crystal growth. The magnetic properties are sensitive to Dy, Nb, and Ga additions. The Dy-containing alloy enhances the intrinsic coercivity of 872 kA/m because Dy partially replaces Nd, forming (Nd, Dy) 2 Fe 14 B. Nb addition refines the microstructure, and consequently increases the exchange coupling between magnetic grains. The Nd 9.5 Fe 75.4 Co 5 Zr 3 B 6.5 Ga 0.6 alloy exhibits the highest remanence (0.92 T) due to Ga addition.