Nano-sized Cu clusters in deeply undercooled CoCuFeNiTa high entropy alloy. (1st March 2020)

• Record Type: Journal Article
• Authors: Rahul, M.R.; Samal, Sumanta; Marshal, A.; Balaji, V.I. Nithin; Pradeep, K.G.; Phanikumar, Gandham
• Is Part Of: Scripta materialia. Number 177(2020)
• Page Start: 58
• Page End: 64
• Publication Date: 2020-03-01
• Subjects: Undercooling -- High entropy alloys -- Growth velocity -- Phase separation -- Phase field simulation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.10.006
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The non-equilibrium response of a high entropy alloy CoCuFeNiTa0.5 has been studied using undercooling as a control parameter. The solidification growth rates are rapid (30–50 m/s) at deep undercooling (>150 °C) and are comparable with conventional alloys. The elemental segregation especially that of Cu as predicted by phase field simulations in lower (<50 °C) undercooling regime matches with the experimental observations. This study indicates that even extreme non-equilibrium conditions during solidification could not avoid elemental segregation at the atomic scale. Graphical abstract: Image, graphical abstract