The nanostructure and mechanical properties of nanocomposite Nbx-CoCrCuFeNi thin films. (October 2017)

• Record Type: Journal Article
• Authors: Braeckman, B.R.; Misják, F.; Radnóczi, G.; Caplovicová, M.; Djemia, Ph.; Tétard, F.; Belliard, L.; Depla, D.
• Is Part Of: Scripta materialia. Number 139(2017)
• Page Start: 155
• Page End: 158
• Publication Date: 2017-10
• Subjects: Sputtering -- Thin films -- Nanocomposites -- High-entropy alloys; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.06.046
• Languages: English
• ISSNs: 1359-6462

Abstract

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 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. Graphical abstract: