Abstract
High-entropy alloys (HEAs) have recently become a vibrant field of study in the metallic materials area. In the early years, the design of HEAs was more of an exploratory nature. The selection of compositions was somewhat arbitrary, and there was typically no specific goal to be achieved in the design. Very recently, however, the development of HEAs has gradually entered a different stage. Unlike the early alloys, HEAs developed nowadays are usually designed to meet clear goals, and have carefully chosen components, deliberately introduced multiple phases, and tailored microstructures. These alloys are referred to as advanced HEAs. In this paper, the progress in advanced HEAs is briefly reviewed. The design strategies for these materials are examined and are classified into three categories. Representative works in each category are presented. Finally, important issues and future directions in the development of advanced HEAs are pointed out and discussed.
Highlights
The concept of high-entropy alloys (HEAs) was proposed by Yeh et al in 2004 [1]
The precipitation of hard η-Ni3 Ti phase drastically improve the wear resistance of the Co27.3 Cr18.2 Fe18.2 Ni27.3 Ti9.1 alloy [114]. Another example is in the AlCoCrx FeMo0.5 Ni alloy, where the formation of σ phase leads to a better resistance to thermal softening at elevated temperatures [115]. These results reveal that second-phase strengthening works well in HEAs
Outlook and Concluding Remarks principles of HEAs is largely focused on designing simple-structured HEAs
Summary
The concept of high-entropy alloys (HEAs) was proposed by Yeh et al in 2004 [1]. It refers to a class of alloys that is composed of five or more principal elements, whose concentrations fall in the range of 5–35 at.% [1]. Derivative systems alloyed with Mo, Mn, Si, B, Zr, Ni, Nb, V, Y, Sn, Zn, C [29,30,31,32,33,34,35,36,37,38] have been reported These early results provided important understanding of the composition-phase-property relationship in HEAs, which made composition design and phase control possible to certain extent. HEAs studied nowadays are usually designed to meet clear goals, and have carefully chosen composing elements, deliberately introduced multiple phases, and tailored microstructures. These alloys will be referred to as advanced HEAs. In this paper, the design strategies of advanced. Because they are directly inspired by the high-entropy concept, these alloys are discussed in the present paper
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