4.7 Article

Investigation of the metastable spinodally decomposed magnetic CrFe-rich phase in Al doped CrFeCoNi alloy

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 939, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2023.168794

Keywords

High entropy alloy; AlCrFeCoNi; Spinodal decomposition; Structural transformation; Magnetization

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We have conducted an in-depth study on the magnetic phase resulting from spinodal decomposition in the BCC phase of a CrFe-rich composition. This magnetic phase is present after casting or water quenching following annealing at 1250 degrees C for 24 h, but absent after annealing in the range of 900-1100 degrees C for 24 h. It is formed in the temperature range of approximately 450-550 degrees C and loses magnetization above 640 degrees C, due to a structural transformation into paramagnetic sigma and FCC phases.
We have conducted an in-depth study of the magnetic phase due to a spinodal decomposition of the BCC phase of a CrFe-rich composition. This magnetic phase is present after casting (arc melting) or water quenching after annealing at 1250 degrees C for 24 h but is entirely absent after annealing in the interval 900-1100 degrees C for 24 h. Its formation is favored in the temperature interval ca 450-550 degrees C and loses magnetization above 640 degrees C. This ferromagnetic-paramagnetic transition is due to a structural transformation from ferromagnetic BCC into paramagnetic sigma and FCC phases. The conclusion from measurements at different heating rates is that both the transformation leading to the increase of the magnetization due to the spinodal decomposition of the parent phase and the vanishing magnetization at 640 degrees C are diffusion controlled. (c) 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).

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