| Issue |
J. Phys. Colloques
Volume 49, Number C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|
|---|---|---|
| Page(s) | C8-673 - C8-674 | |
| DOI | https://doi.org/10.1051/jphyscol:19888306 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-673-C8-674
DOI: 10.1051/jphyscol:19888306
Department of Metallurgy and Science of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, G.B.
J. Phys. Colloques 49 (1988) C8-673-C8-674
DOI: 10.1051/jphyscol:19888306
PHASE CHEMISTRY AND PROPERTIES OF ALNICO 2 PERMANENT MAGNETS
M. G. Hetherington, A. Cerezo, J. P. Jakubovics et G. D. W. SmithDepartment of Metallurgy and Science of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, G.B.
Abstract
The isotropic permanent magnet alloy Alnico 2 has been studied by atom probe field-ion microscopy and high voltage transmission electron microscopy. An interconnected microstructure of α1 (Fe-Co rich) and α2 (Al-Ni rich) phases was found, with a third, copper-rich phase present in the form of ~ 5 nm diameter precipitates in the α2 phase. Domain wall pinning at these precipitates is suggested as a cause of the increase in coercivity with the addition of copper.