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Title: Highly complex magnetic behavior resulting from hierarchical phase separation in AlCo(Cr)FeNi high-entropy alloys
Authors: Lan, Qianqian
Kovács, András
Caron, Jan
Du, Hongchu
Song, Dongsheng
Dasari, Sriswaroop
Gwalani, Bharat
Chaudhary, Varun
Ramanujan, Raju V.
Banerjee, Rajarshi
Dunin-Borkowski, Rafal E.
Keywords: Engineering::Materials
Issue Date: 2022
Source: Lan, Q., Kovács, A., Caron, J., Du, H., Song, D., Dasari, S., Gwalani, B., Chaudhary, V., Ramanujan, R. V., Banerjee, R. & Dunin-Borkowski, R. E. (2022). Highly complex magnetic behavior resulting from hierarchical phase separation in AlCo(Cr)FeNi high-entropy alloys. IScience, 25(4), 104047-.
Project: A1898b0043 
Journal: iScience 
Abstract: Magnetic high-entropy alloys (HEAs) are a new category of high-performance magnetic materials, with multicomponent concentrated compositions and complex multi-phase structures. Although there have been numerous reports of their interesting magnetic properties, there is very limited understanding about the interplay between their hierarchical multi-phase structures and the resulting magnetic behavior. We reveal for the first time the influence of a hierarchically decomposed B2 + A2 structure in an AlCo0.5Cr0.5FeNi HEA on the formation of magnetic vortex states within individual A2 (disordered BCC) precipitates, which are distributed in an ordered B2 matrix that is weakly ferromagnetic. Non-magnetic or weakly ferromagnetic B2 precipitates in large magnetic domains of the A2 phase, and strongly magnetic Fe-Co-rich interphase A2 regions, are also observed. These results provide important insight into the origin of coercivity in this HEA, which can be attributed to a complex magnetization process that includes the successive reversal of magnetic vortices.
ISSN: 2589-0042
DOI: 10.1016/j.isci.2022.104047
Schools: School of Materials Science and Engineering 
Rights: © 2022 The Authors. This is an open access article under the CC BY license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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