Phase stability and mechanical properties of novel high entropy transition metal carbides

被引:570
作者
Harrington, Tyler J. [1 ,2 ]
Gild, Joshua [2 ]
Sarker, Pranab [3 ]
Toher, Cormac [3 ]
Rost, Christina M. [4 ]
Dippo, Olivia F. [2 ]
McElfresh, Cameron [1 ]
Kaufmann, Kevin [1 ]
Marin, Eduardo [1 ]
Borowski, Lucas [1 ]
Hopkins, Patrick E. [4 ]
Luo, Jian [1 ,2 ]
Curtarolo, Stefano [5 ]
Brenner, Donald W. [6 ]
Vecchio, Kenneth S. [1 ,2 ]
机构
[1] Univ Calif San Diego, Dept NanoEngn, La Jolla, CA 92093 USA
[2] Univ Calif San Diego, Mat Sci & Engn Program, La Jolla, CA 92093 USA
[3] Duke Univ, Dept Mech Engn & Mat Sci, Durham, NC 27708 USA
[4] Univ Virginia, Dept Mech & Aerosp Engn, Charlottesville, VA 22904 USA
[5] Duke Univ, Mat Sci Elect Engn Phys & Chem, Durham, NC 27708 USA
[6] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA
关键词
Carbides; High-entropy alloys; Entropy-stabilized; Multicomponent; Hardness; ELECTRONIC-PROPERTIES; WEAR BEHAVIOR; HARDNESS; ALLOYS; MICROSTRUCTURE; WC;
D O I
10.1016/j.actamat.2018.12.054
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Twelve different equiatomic five-metal carbides of group IVB, VB, and VIB refractory transition metals are synthesized via high-energy ball milling and spark plasma sintering. Implementation of a newly developed ab initio entropy descriptor aids in selection of candidate compositions for synthesis of high entropy and entropy stabilized carbides. Phase formation and composition uniformity are analyzed via XRD, EDS, STEM-EDS, and EXAFS. Nine of the twelve candidates form true single-phase materials with the rocksalt (B1) structure when sintered at 2473 K and can therefore be investigated as high entropy carbides (HECs). The composition (V0.2Nb0.2Ta0.2Mo0.2W0.2)C is presented as a likely candidate for further investigation as an entropy stabilized carbide. Seven of the carbides are examined for mechanical properties via nanoindentation. The HECs show significantly enhanced hardness when compared to a rule of mixtures average of the constituent binary carbides and to the highest hardness of the binary constituents. The mechanical properties are correlated to the electronic structure of the solid solutions, offering a future route to tunability of the mechanical properties of carbide ceramics via exploration of a new complex composition space. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:271 / 280
页数:10
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