Journal
INTERMETALLICS
Volume 52, Issue -, Pages 105-109Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2014.04.001
Keywords
Alloy design; Crystallography; Phase stability; prediction
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Funding
- National Natural Science Foundation of China [51134013, 51104029]
- China Postdoctoral Science Foundation Funded Project
- Fundamental Research Funds for the Central Universities
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Topologically close-packed (TCP) phases with complex structures are often observed in high entropy alloys (HEAs). Currently, these TCP phases are garnering significant interest from both theoretical and experimental perspectives due to the ductility deterioration of the high strength HEAs. Alternatively, there are instances when TCP phases can actually benefit the mechanical performances of alloys, such as the wear resistance. Therefore, the stability of TCP phases should be taken into consideration in the alloy design. In this paper, the relationship between the TCP phase stability and the physicochemical/thermodynamic properties of alloying components in HEAs was systematically studied. The stability of TCP phases was found to correlate well with the electro-negativity difference (Delta X) for most of the reported HEAs. The stability of TCP phases is well delineated by the electro-negativity difference (Delta X): i.e., TCP phases are stable at Delta X > 0.133 except for some HEAs that contain a significant amount of aluminum. (C) 2014 Elsevier Ltd. All rights reserved.
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