期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 735, 期 -, 页码 897-904出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.11.075
关键词
High-entropy alloy; Laves phase; Eutectic; Tantalum
资金
- Natural Science Foundation of China [51371050, 51301038]
- Industry-University Strategic Research Program, Jiangsu Province, China [BA2014088]
- Key Research Project, Jiangsu Province, China [BE2015097]
- Six Talent Peaks Project in Jiangsu Province, China [2015-XCL-004]
- Key Laboratory for Advanced Metallic Materials, Jiangsu Province, China [BM2007204]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1726]
- Australian Research Council Discovery Project [DP160104632]
Eutectic high-entropy alloys are potential replacements of structural alloys, due to their microstructure and properties. In this work, CoCrFeNiTax (x = 0.1, 0.2, 0.3, 0.395, 0.4 and 0.5, x value in molar ratio) eutectic high-entropy alloys were produced by arc melting technique. Two phases, FCC solid solution and Laves phase, are identified in the alloys. The alloys are transformed from hypoeutectic to hypereutectic solidification by increasing Ta content. CoCrFeNiTa0.395 eutectic high-entropy alloy exhibits an ultrahigh yield strength of 1.4 GPa, while CoCrFeNiTa0.3 hypoeutectic high-entropy alloy shows a compressive strength of 2.5 GPa and a considerable fracture strain of 44%. Such remarkable strengthening effects are shown to result from the ideal combination among the second-phase, solid solution, and boundary strengthening. (C) 2017 Elsevier B.V. All rights reserved.
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