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
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.
|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|