Structure and hardness of in situ synthesized nano-oxide strengthened CoCrFeNi high entropy alloy thin films

SCRIPTA MATERIALIA

卷:203

Article

Lee, Subin¹  Chatain, Dominique²  Liebscher, Christian H.¹  Dehm, Gerhard¹ 

[1] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany

[2] Aix Marseille Univ, CINaM, CNRS, F-13288 Marseille, France

关键词: High entropy alloys;    Thin films;    Internal oxidation;    Nanoindentation;    Scanning;    transmission electron microscopy (STEM);   

DOI  :  10.1016/j.scriptamat.2021.114044

来源: Elsevier

【 摘 要 】

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. (c) 2021 The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )

【 授权许可】

Free