期刊
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
卷 21, 期 6, 页码 299-311出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cossms.2017.09.002
关键词
High-entropy alloys; Concentrated solid solutions; Physical metallurgy; Physical properties; Sluggish diffusion; Severe lattice distortion
资金
- Ministry of Science and Technology of Taiwan [MOST 102-2221-E-007-047-MY3]
The alloy world could be divided into low-entropy (LEAs), medium-entropy (MEAs) and high-entropy alloys (HEM) based on the configurational entropy at the random solution state. In HEM, four core effects, i.e. high entropy, sluggish diffusion, severe lattice distortion and cocktail effects, are much more significant than low-entropy alloys in affecting phase transformation, microstructure and properties. In fact, the degree of the influence from these core effects more or less increases with increased mixing entropy. The trend is gradual from low-entropy alloys to high-entropy alloys. In this article, physical metallurgy of HEAs is discussed with the bridge connected to that of conventional alloys. As disordered and ordered solid solutions are the main constituent phases of alloys, the understanding of solid solutions is fundamental for the understanding of alloys. In addition, as dilute solid solutions have been well treated in current physical metallurgy, concentrated solid solutions from low-entropy to high-entropy alloys are focused in this article. Physical properties are especially emphasized besides mechanical properties. (C) 2017 Elsevier Ltd. All rights reserved.
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