Abstract
Four Fe-30/33Cr-11.5/12.5Co-0/1Si alloys (weight fraction) melted in air and treated by alternatively ageing and rolling have been studied by magnetic measurements and electron microscopy. The optimum treatment procedures have been determined and the best obtained magnetic properties are Hc = 54.0 kA m−1, Br = 1.19 T and (BH)m = 29.6 kJ m−1. Transmission electron microscopy proves that rolling after spinodal ageing is effective in elongating and aligning the original isotropic spinodal structures. The extent of elongation is quantitatively related to the amount of area reduction in rolling. Magnetic properties are found to be not very sensitive to slight variations in composition, cooling rates and the temperature of intermediate rolling, and to be tailorable by the exact control of the rolling operation. The rolling-ageing technique as a manufacturing process for Fe-Cr-Co magnets is thought to be promising. Finally, ways of further improvement are discussed.
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Chin, T.S., Wu, T.S., Chang, C.Y. et al. Electron microscopy and magnetic properties of Fe-Cr-Co-Si permanent magnet alloys manufactured by rolling-ageing technique. J Mater Sci 18, 1681–1688 (1983). https://doi.org/10.1007/BF00542063
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DOI: https://doi.org/10.1007/BF00542063