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Correlation between microstructure and magnetic properties during phase separation in concentrated Fe-Cr alloys

Abstract : We report a theoretical study of microstructure, magnetic properties, and their relationship in relatively concentrated Fe-Cr alloys in both Fe- and Cr-rich regions. Annealing of initially random systems at 500° C for times of the order of 106 s substantially changes their microstructure. In both systems, solute atoms form clusters with their sizes increasing with time according to power law, with exponent being close to 0.2. For the Fe-32 at. % Cr alloy, magnetization and the Curie temperature increase with increasing annealing time and cluster size. At large simulation times, the Curie temperature approaches its value for Fe-15 at. % Cr, the concentration of completely phase-separated iron-rich alloy. For the Cr-25 at. % Fe alloy, precipitation also results in an increase of magnetization and the Curie temperature, although characteristic times are about one order of magnitude greater.
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Submitted on : Tuesday, September 1, 2020 - 6:02:15 PM
Last modification on : Wednesday, September 2, 2020 - 3:23:46 AM

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Mikhail Yu. Lavrentiev, Chu Chun Fu, Frédéric Soisson. Correlation between microstructure and magnetic properties during phase separation in concentrated Fe-Cr alloys. Journal of Magnetism and Magnetic Materials, Elsevier, 2020, 506, pp.166763. ⟨10.1016/j.jmmm.2020.166763⟩. ⟨cea-02927615⟩

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