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Updated: Dec 10, 2025

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Published on: June 7, 2018
Magnetic properties of the complex concentrated alloy system CoFeNi0.5Cr0.5Alx
N A Morley1, B Lim1, J Xi1
1Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mapping St., Sheffield, S1 3JD, UK.
Abstract:
We study the change in magnetisation with paramagnetic Al addition in the CoFeNi0.5Cr0.5-Alx (x: 0, 0.5, 1, and 1.5) complex concentrated alloy. The compositions were developed utilising the Mulliken electronegativity and d-electron/atom ratio. Spherical FeCr rich nanoprecipitates are observed for X: 1.0 and 1.5 in an AlCoNi-rich matrix. A ~ 5 × increase in magnetisation (from 22 to 96 Am2/kg) coincides with this nanoprecipitate formation-the main magnetic contribution is determined to be from FeCr nanoprecipitates. The magnetisation increase is strange as paramagnetic Al addition dilutes the ferromagnetic Fe/Co/Ni additions. In this paper we discuss the magnetic and structural characterisation of the CoFeNi0.5Cr0.5-Alx composition and attempt to relate it to the interfacial energy.
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