Cr-Mo-V-W: A new refractory and transition metal high-entropy alloy system. (1st January 2019)

• Record Type: Journal Article
• Authors: Ikeuchi, D.; King, D.J.M.; Laws, K.J.; Knowles, A.J.; Aughterson, R.D.; Lumpkin, G.R.; Obbard, E.G.
• Is Part Of: Scripta materialia. Number 158(2019)
• Page Start: 141
• Page End: 145
• Publication Date: 2019-01-01
• Subjects: Alloy Search and Predict (ASAP) -- Refractory metals -- CALPHAD -- Density functional theory (DFT) -- Microstructure; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.08.045
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Cr-Mo-V-W high-entropy alloy (HEA) is studied, with 2553 K equilibrium solidus and high Cr content to promote protective oxide scale formation, suggesting potential applications in hot, oxidising environments. Alloy Search and Predict (ASAP) and phase diagram calculations found a single phase, body-centred cubic (BCC) solid solution at elevated temperatures, across the range of compositions present within the system - uncommon for a HEA of refractory and transition metals. Density functional theory identified solubility of 22 at.% Cr at solidus temperature, with composition-dependent drive for segregation during cooling. An as-cast, BCC single-phase with the composition 31.3Cr-23.6Mo-26.4 V-18.7 W exhibiting dendritic microsegregation was verified. Graphical abstract: Unlabelled Image