Magneto-structural correlations in Fe-25 at%Al influenced by substitution of Fe by Co and by thermal treatment

The scanning electron microscopy, X-ray diffraction, positron annihilation spectroscopy, Mössbauer spectrometry, and measurements of magnetic characteristics by vibrating sample magnetometer complemented by theoretical simulations are applied in the present investigations of the Fe-Al-Co alloys with...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-05, Vol.904, p.163996, Article 163996
Main Authors: Jiraskova, Y., Pizurova, N., Bursik, J., Friak, M., Cizek, J., Vlasak, T., Cegan, T., Nikodym, M., Lunacek, J.
Format: Article
Language:English
Subjects:
B2 structure (crystals)
Cobalt base alloys
Fe-Al(Co) alloys
Heat treatment
Iron
Liquid cooling
Magnetic properties
Magnetometers
Microstructure
Morphology
Mössbauer spectrometry
Positron annihilation
Positron annihilation spectroscopy
Vacancies
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Summary:The scanning electron microscopy, X-ray diffraction, positron annihilation spectroscopy, Mössbauer spectrometry, and measurements of magnetic characteristics by vibrating sample magnetometer complemented by theoretical simulations are applied in the present investigations of the Fe-Al-Co alloys with 25 at% Al and Co substituting Fe in amount of 15 at% or 25 at%. The alloys prepared by slightly different technologies resulting in different structural morphologies are subjected to thermal treatment followed by slow cooling and water cooling. It is shown that the alloy with lower Co content and the initial A2 structure is more sensitive to the thermal treatments from the viewpoints of changes in morphology, defects concentration and magnetic properties in comparison to the other one with the initial B2 structure. This is reflected almost in all experimentally obtained results. [Display omitted] •Fe-25 at.% Al and Co substituting Fe alloys are prepared and thermally treated.•Morphology, phase, defect, and magnetic studies are concentrated to region of phase separation.•Hysteresis loops are simulated by the Jiles-Atherton model extended for anisotropic materials.•Theoretical calculations of lifetimes determine type of defects.•Vacancies, vacancy clusters and/or triple defects are discussed from the structural and compositional viewpoint.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2022.163996