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论文类型：期刊论文

发表时间：2014-09-01

发表刊物：INTERMETALLICS

收录刊物：SCIE、EI

卷号：52

页面范围：105-109

ISSN号：0966-9795

关键字：Alloy design; Crystallography; Phase stability; prediction

摘要：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.