The nanostructure and mechanical properties of nanocomposite Nbx-CoCrCuFeNi thin films

B.R Braeckman,F Misják,G Radnóczi,M Caplovicová,Ph Djemia,F Tétard,L Belliard,D Depla

doi:10.1016/j.scriptamat.2017.06.046

The nanostructure and mechanical properties of nanocomposite Nbx-CoCrCuFeNi thin films

B.R Braeckman, F Misják + Show 6 more

https://doi.org/10.1016/j.scriptamat.2017.06.046

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Journal: Scripta materialia	Publication Date: Jun 30, 2017
Citations: 37

Affiliation: Ghent University, Centre for Energy Research, Hungarian Academy of Sciences, University of Technology, Université Paris Cité, Sorbonne Paris Cité, Université Sorbonne Paris Nord, French National Centre for Scientific Research, Laboratoire des Sciences des Procédés et des Matériaux, Paris Institute of Nanosciences, Sorbonne Université

#High Entropy Alloy Thin Films #Increasing Nb Concentration + Show 8 more

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Abstract

The relation between the nanostructure and the mechanical properties of Nbx-CoCrCuFeNi high entropy alloy thin films was explored. With increasing Nb concentration (0 to 24at.% Nb), a transition from a single phase face-centered cubic solid solution to an amorphous phase is observed. At intermediary Nb fractions (5 to 15at.% Nb) a nanocomposite structure is formed that consists of nanosized crystallites embedded in an amorphous matrix. The nanocomposite structure leads to an increase in hardness beyond the Hall-Petch breakdown. The shear and Young's moduli decrease with increasing Nb concentration, which is beneficial for the alloy ductility.

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