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Eddy-Current Testing of an Iron–Cobalt–Alumina-Based Magnetic Nanocrystals

The nanocrystalline iron–cobalt–alumina alloy displays exceptional properties compared to conventional materials with the same concentration due to the impact of the crystal size. Nanocrystalline FeCo/Al 2 O 3 was produced from elementary Fe, Co, and Al 2 O 3 powdered materials by mechanical alloyin...

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Published in:Powder metallurgy and metal ceramics 2022-07, Vol.61 (3-4), p.197-204
Main Author: Younes, A.
Format: Article
Language:English
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Summary:The nanocrystalline iron–cobalt–alumina alloy displays exceptional properties compared to conventional materials with the same concentration due to the impact of the crystal size. Nanocrystalline FeCo/Al 2 O 3 was produced from elementary Fe, Co, and Al 2 O 3 powdered materials by mechanical alloying. This work aims to study the electromagnetic properties of nanocrystalline Fe/Al 2 O 3 and FeCo/Al 2 O 3 powder alloys. The approach adopted in this study implies using nondestructive testing (NDT) techniques to follow the evolution of this alloy's microstructural, morphological, and electromagnetic properties at all elaboration stages. Also, a relationship between the structural and morphological properties of the NDT techniques was established. The morphological, structural, and magnetic characterization of these powders was carried out with a scanning electron microscope (SEM), X-ray diffractometer (XRD), and vibrating sample magnetometer (VSM). The evolution of these properties is verified by eddy current techniques (ECT). In terms of structure, increasing the grinding time of nanocrystalline Fe/Al 2 O 3 decreases the average crystallite size and induces internal stress. On the other hand, from an electromagnetic point of view, the electromagnetic properties of materials depend on their composition, structure, residual stresses, and elaboration. The nature of the material, the phases present in the material, and the particle size are the parameters that provide the impedance diagram with a shape. The imaginary part L / L 0 is always higher than 1, indicating that the material preserves its magnetic properties. However, the addition of cobalt improves the electromagnetic properties of the Fe/Al 2 O 3 system.
ISSN:1068-1302
1573-9066
DOI:10.1007/s11106-022-00309-6