Magnetic property enhancement of directly quenched Nd–Fe–B bulk magnets with Ti substitution

• Published in: Journal of alloys and compounds Vol. 489; no. 2; pp. 499 - 503
• Main Authors: Chang, H.W., Shih, M.F., Hsieh, C.C., Chang, W.C., Shen, C.Y.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 21.01.2010; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Copper mold casting; Exact sciences and technology; Fe and its alloys; Hard magnetic material; Magnetic properties; Magnetic properties and materials; Permanent magnets; Physics; Studies of specific magnetic materials; 75.50.Vv; 75.50.Ww; Hard magnetic material; Copper mold casting; 74.25.Ha; Magnetic properties; Grain size; Permanent magnets; Neodymium alloys; Boron alloys; Casting; Titanium alloys; Experimental result; Copper; Microstructure; Iron base alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2009.09.094

Magnetic properties, phase evolution, and microstructure of directly quenched Nd y Fe 85− x− y Ti x B 15 ( x = 0–4; y = 8–10) bulk magnetic rods with a diameter of 0.7 mm were studied. The experimental results show that Ti substitution can not only suppress the formation of the Nd 2Fe 23B 3 and one unknown phases, leading to the presence of the large amount of Nd 2Fe 14B phase, but also refine the grain size, resulting in the remarkable enhancement of magnetic properties. Besides, proper Ti substitution and Nd concentration can well modify phase constitution and uniformly refine grain size. In this study, the optimal magnetic properties of B r = 6.5 kG, i H c = 10.3 kOe and (BH) max = 8.7 MGOe are achieved in Nd 9.5Fe 72.5Ti 3B 15 magnet.