Structure and hardness of in situ synthesized nano-oxide strengthened CoCrFeNi high entropy alloy thin films. (October 2021)

• Record Type: Journal Article
• Authors: Lee, Subin; Chatain, Dominique; Liebscher, Christian H.; Dehm, Gerhard
• Is Part Of: Scripta materialia. Number 203(2021)
• Publication Date: 2021-10
• Subjects: High entropy alloys -- Thin films -- Internal oxidation -- Nanoindentation -- Scanning/transmission electron microscopy (STEM); Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114044
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Abstract: In this study, we report on face-centered cubic structured CoCrFeNi high-entropy alloy thin films with finely dispersed nano-oxide particles which are formed by internal oxidation. Analytical scanning transmission electron microscopy imaging found that the particles are Cr 2 O 3 . The oxide particles contribute to the hardening of the film increasing its hardness by 14% compared to that of the film without precipitates, through the Orowan-type strengthening mechanism. Our novel approach paves the way to design medium- and high-entropy alloys with high strength by making use of oxide phases.