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TEM studies of the effects of Zr additions on some HDDR- processed, high boron, NdFeB-type powders and hot-pressed magnets

Yi, G., Chapman, J.N., Brown, D.N., and Harrison, I.R. (2000) TEM studies of the effects of Zr additions on some HDDR- processed, high boron, NdFeB-type powders and hot-pressed magnets. Journal of Magnetism and Magnetic Materials, 220 (2-3). 115 -123. ISSN 0304-8853 (doi:10.1016/S0304-8853(00)00502-3)

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Publisher's URL: http://dx.doi.org/10.1016/S0304-8853(00)00502-3

Abstract

The transmission electron microscope has been used to study the physical and magnetic microstructures of two HDDR-processed NdFeB-type alloys, one without Zr and the other containing 1.1 at% Zr. Studies were made of the as-produced powders and the solids produced following hot-pressing at 900 degrees C. In the HDDR powders, the principal effects of adding Zr were to reduce the average grain size by approximate to 1/3 and made the grain size distribution more uniform. In the hot-pressed samples, the effect of Zr was more dramatic in that grain growth was very significantly reduced. Zr-containing phases were identified and a simple model, due to Zener, used to provide a plausible explanation of how the small amount of Zr present could stabilise the grain size to approximate to 0.5 mu m. The microstructural results correlated well with measured magnetic properties.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):Harrison, Dr Ian
Authors: Yi, G., Chapman, J.N., Brown, D.N., and Harrison, I.R.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Magnetism and Magnetic Materials
ISSN:0304-8853

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