期刊
SCIENCE BULLETIN
卷 64, 期 12, 页码 856-864出版社
ELSEVIER
DOI: 10.1016/j.scib.2019.05.007
关键词
High-entropy intermetallic compound; Aluminide; Phase stability; High-entropy alloy; High-entropy ceramic
资金
- Vannevar Bush Faculty Fellowship - Basic Research Office of the Assistant Secretary of Defense for Research and Engineering
- Office of Naval Research [N00014-16-1-2569]
- State Key Laboratory of High Performance and Complex Manufacturing at Central South University [ZZYJKT2018-04]
High-entropy intermetallic compounds (HEICs) were fabricated by mechanical alloying and spark plasma sintering to fill a knowledge gap between the traditional high-entropy alloys (HEAs) and emerging high-entropy ceramics (HECs). Notably, several four- or five-component equimolar aluminides, such as the B2-phase (Fe1/5Co1/5Ni1/5Mn1/5Cu1/5)Al, have been made into single-phase HEICs for the first time. Thermodynamic modeling and a reversible, temperature-dependent, phase-stability experiment suggest that such B2-phase HEICs are entropy-stabilized phases. The structure of these HEICs resembles that of HEC5 with high-entropy mixing of four or five elements of nearly equal fractions in one and only one sublattice, but with significant (similar to 10%) anti-site defects (differing from typical HEC5). A new phase stability rule for forming single B2-phase HEICs is proposed. Five additional HEICs of predominantly D0(22) phases have also been made. This study broadens the families of equimolar, single-phase, high-entropy materials that have been successfully fabricated. (C) 2019 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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