Title :
Magnetic and microstructure studies of boron-enriched (Nd0.95 La0.05)11Fe76.5$ -xCo xTi2B10.5 (x=0-15) melt-spun ribbons
Author :
Chang, W.C. ; Wang, S.H. ; Chang, S.J. ; Chen, Q.
Author_Institution :
Dept. of Phys., Chung Cheng Univ., Ming-Hsiung, Taiwan
fDate :
9/1/2000 12:00:00 AM
Abstract :
The magnetic properties and microstructures of rare earth lean and boron-rich (Nd0.95La0.05)11 Fe76.5-xCoxTi2B10.5 (x=0-15) melt-spun ribbons have been investigated. Two magnetic phases, namely α-Fe and R2Fe14B, were found, by thermal magnetic analysis (TMA), in all the ribbons studied. High intrinsic coercivity (iHc) and maximum energy product [(BH)max] values in the range of 14-18.7 kOe and 13.9-18.3 MGOe, respectively, have been achieved in these nanocomposites. Among compositions studied, the Co-substitutions, x⩽10, were found to be effective in increasing the Br and (BH)max, while keeping a high value of iHc. It was evidenced from transmission electron microscopy that the homogeneity, fine grain size, and high volume fraction of the R2Fe14B phase led to an increase in the iHc and maximum energy product of nanocomposites studied. The optimum magnetic properties of Br=9.4 kG, iHc=16.1 kOe and (BH)max=18.3 MGOe have been obtained on (Nd0.95La0.05 )11Febal.Co10Ti2B 10.5 ribbons after an optimum treatment
Keywords :
boron alloys; cobalt alloys; coercive force; crystal microstructure; grain size; iron alloys; lanthanum alloys; nanostructured materials; neodymium alloys; permanent magnets; titanium alloys; transmission electron microscopy; (Nd0.95La0.05)11(FeCo)76.5 Ti2B10.5; grain size; homogeneity; intrinsic coercivity; maximum energy product; melt-spun ribbons; microstructure; nanocomposites; thermal magnetic analysis; transmission electron microscopy; volume fraction; Chromium; Cobalt alloys; Coercive force; Iron alloys; Magnetic analysis; Magnetic properties; Microstructure; Nanocomposites; Neodymium; Wheels;
Journal_Title :
Magnetics, IEEE Transactions on
