The effect of pressure tuning on the structure and mechanical properties of high-entropy carbides. (15th July 2022)

• Record Type: Journal Article
• Authors: Guan, Shixue; Lin, Weitong; Liang, Hao; Liang, Wenjia; Tian, Yi; He, Duanwei; Peng, Fang
• Is Part Of: Scripta materialia. Number 216(2022)
• Publication Date: 2022-07-15
• Subjects: High-entropy carbides -- High-pressure solid-state reaction -- In-Situ high-pressure synchrotron radiation -- Phase stability -- Mechanical properties; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114755
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: High-purity (Ta0.2 Nb0.2 Hf0.2 Zr0.2 Ti0.2 )C high-entropy ceramics are successfully synthesized using high-pressure solid-phase reactions. The high-entropy phase formation route and the effect of pressure tuning on the structural and mechanical properties of the ceramics are systematically investigated. An interesting process is observed whereby a double phase high-entropy carbide is formed, followed by the defusing of one phase into another, and the eventual formation of a high-entropy phase. Moreover, an abnormal, pressure-induced enhancement of the bulk modulus and strength is observed, resulting from the crystal plane distortion in high-entropy carbides. These results reflect the unusual lattice distortion effects of continuous, pressure-induced tuning on the structure and properties of high-entropy carbides. Graphical abstract: Image, graphical abstract