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The traditional approach to materials design is to start with a base composition and then tune its chemistry by adding smaller amounts of other elements or compounds. However, a new approach has emerged; mixing similar amounts of each component can result in only a single- or few-phase material. This has been demonstrated for a range of alloys and ceramics, which are generally known as ‘high-entropy’ materials. Interest in these materials is driven by: 1) advanced properties, which make them promising for applications such as structural components and in energy storage, and 2) fascinating science in how their properties are determined by their electronic, atomic and micro-scale structure.
This Collection will bring together the latest thinking and new understanding of high-entropy alloys and ceramics, and works related to their applications. A secondary aim is to encourage an exchange of ideas between the high-entropy alloys and high-entropy ceramics communities. Topics of interest include the following:
Fundamental understanding of formation, structure and behavior
Property characterization, including for specific applications
Applications demonstrations
Advanced theoretical, simulation and experimental approaches
Synergy between high-entropy alloys and high-entropy ceramics
We welcome the submission of any paper related to high-entropy alloys and ceramics. All submissions will be subject to the same review process and editorial standards as regular Communications Materials Articles.
High-entropy materials have been realized in a wide number of alloys and ceramics, usually in bulk form. This Perspective discusses the emerging field of two-dimensional high-entropy materials, focusing on their formation, structure and applications.
High-entropy materials are defined by the configurational entropy of their bulk phase, yet it is interesting to consider whether grain boundaries can also be “high entropy”. This paper discusses a thermodynamic framework for “high-entropy grain boundaries” and relevant concepts and unique thermodynamic properties.
In body-centered cubic alloys, screw dislocations are considered to be strength-controlling. Here, a systematic investigation of Mo-Ti alloys with varying lattice misfit reveals a transition from screw to edge dislocation-controlled strength.
Local chemical ordering has been shown to improve the mechanical properties of high-entropy alloys. Here, Zr- and (Nb, Ta)-locally enriched ordering is found to enhance both the dynamic strength and ductility of a TiZrNbTa high-entropy alloy under high strain rate loading.
Short-range chemical ordering has emerged as a key feature for controlling the properties of high-entropy alloys. Here, ab initio calculations reveal that two types of short-range ordering exist in Si–Ge–Sn medium-entropy alloys, suggesting that multiple types of ordering could exist in a single alloy.