Comparison of microstructure and magnetic properties of gas-atomized and melt-spun MRE-Fe-Co-M-B (MRE = Y+Dy+Nd, M = Zr+TiC)

TitleComparison of microstructure and magnetic properties of gas-atomized and melt-spun MRE-Fe-Co-M-B (MRE = Y+Dy+Nd, M = Zr+TiC)
Publication TypeJournal Article
Year of Publication2007
AuthorsTang W, Wu YQ, Dennis KW, Kramer MJ, Anderson IE, McCallum RW
Journal TitleJournal of Applied Physics
Volume101
Pages09K510
Date PublishedMay
Type of ArticleProceedings Paper
ISBN Number0021-8979
Accession NumberISI:000246567900378
Keywordssingle-crystals
Abstract

An MRE2(Fe,Co)(14)B alloy with Zr substitution and TiC addition was systematically studied. It was found by means of X-ray diffraction, transmission electron microscopy (TEM) and magnetic measurements that the combination of Zr substitution and TiC addition yields adequate microstructural control in both gas atomization (GA) and melt spinning (MS) techniques. For MS ribbons, an H-cj of 11.7 kOe and (BH)(max) of 11.9 MGOe at 27 degrees C were obtained in the ribbons spun at 16 m/s and annealed at 700 degrees C for 15 min. For GA powders, an H-cj of 9.1 kOe and (BH)(max) of 9.2 MGOe at 27 degrees C were obtained in 20-25 mu m GA powder annealed at 700 degrees C for 15 min. The temperature coefficients of B-r and H-cj are 0.06 and 0.36%/degrees C for the MS ribbon and 0.09 and 0.4%/degrees C for the GA powder in the temperature range of 27-100 degrees C, respectively. TEM images revealed that the MS ribbon consists of a fine and uniform microstructure with an average size of 30 nm, while the GA spherical powder consists of an interior coarsened microstructure with a grain size of 80 nm and a rim area with a grain size of 10 nm. (c) 2007 American Institute of Physics.

DOI10.1063/1.2710551
Alternate JournalJ. Appl. Phys.