Mössbauer analysis of compositional tuning of magnetic exchange interactions in high entropy alloys

We measured the change in the average hyperfine field strength of several high entropy alloys in relation to small compositional deviations from the equiatomic alloy, FeCoNiCuMn. Mössbauer spectra of four psuedo-binary systems, in which Mn content is increased and another element was decreased in eq...

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Bibliographic Details
Published in:AIP advances 2019-03, Vol.9 (3), p.035329-035329-4
Main Authors: Perrin, Alice, Sorescu, Monica, Ravi, Vishal, Laughlin, David E., McHenry, Michael E.
Format: Article
Language:English
Subjects:
Alloying elements
Alloys
Binary systems
Exchanging
Field strength
High entropy alloys
Hyperfine structure
Linearity
Manganese
Perturbation methods
Regression analysis
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Summary:We measured the change in the average hyperfine field strength of several high entropy alloys in relation to small compositional deviations from the equiatomic alloy, FeCoNiCuMn. Mössbauer spectra of four psuedo-binary systems, in which Mn content is increased and another element was decreased in equal measure, reveal several discrete peaks in the hyperfine field distribution that show evidence of the discrete exchange interactions between magnetic elements in the alloy. A simple linear regression modelling the perturbation of the average hyperfine field when the composition is altered calculates the contribution of each atom to the overall average. The average hyperfine field is linear with Tc, so these values allow us to estimate Tc for alloys with more complex compositional variation within the window of linearity (
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5079744