The nanostructure and mechanical properties of nanocomposite Nb-x-CoCrCuFeNi thin films

Braeckman, B. R. and Misják, Fanni and Radnóczi, György and Caplovicova, M. and Djemia, P. H. (2017) The nanostructure and mechanical properties of nanocomposite Nb-x-CoCrCuFeNi thin films. Scripta Materialia, 139. pp. 155-158. ISSN 1359-6462

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Abstract

The relation between the nanostructure and the mechanical properties of Nb-x-CoCrCuFeNi high entropy alloy thin films was explored. With increasing Nb concentration (0 to 24 at.% Nb), a transition from a single phase face-centered cubic solid solution to an amorphous phase is observed. At intermediary Nb fractions (5 to 15 at.% 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. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved,

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