Editorial for special issue on nanostructured high-entropy materials
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Editorial for special issue on nanostructured high-entropy materials Yong Zhang 1,2,3) and Rui-xuan Li 1) 1) Beijing Advanced Innovation Center of Materials Genome Engineering, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China 2) Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University, Xining 810016, China 3) Shunde Graduate School, University of Science and Technology Beijing, Foshan 528399, China
It is our great honor as Guest Editors of the journal International Journal of Minerals Metallurgy and Materials (IJMMM) to present the special issue on the topic of ‘‘Nanostructured High-Entropy Materials’’. It provides the most recent research developments in the preparation and properties of high entropy materials, as well as their potential applications. For a long time, nanostructured materials have played a decisive role in human civilization, and the requirements for their comprehensive performance have become higher and higher, especially the integrated circuit (IC) chips which are the integration of lots of nanostructured devices. The materials are developed with an increasing of entropy, and new materials are developed based on the order/disorder, which is measured by configurational entropy. Bulk metallic glass and high entropy alloys (HEAs) are the two typical examples. Before 1990s, metallic glasses can only be formed in low dimensions, wires, ribbons, and powders, because very high cooling rate is usually needed to form traditional metallic glasses. After then, the bulk metallic glasses are discovered by using a slow cooling rate, which are stabilized by the high entropy, because the bulk metallic glasses can only be formed in multicomponent alloy systems, at least three elements, usually five or more. Thus, the bulk metallic glasses can also be called high-entropy metallic-glasses. High entropy alloys are usually defined for the solid solution alloys, which have very high strength and ductility and can be used at very high temperatures. The solid solution of high entropy alloys is very special, because no dominant element to be regarded as the solvent. Now, the concept of high entropy alloys has been expended to high entropy materials, which are defined by their high configuration entropy. The components can be elements, nitrides, carbides, or oxides; the dimensions can be particles, fibers, films, and/or bulk. High-entropy fibers, high-entropy
films, and lightweight high entropy alloys are most important for the future applications. Obviously, the high entropy materials have greatly enriched the types of materials and provided a larger research space for seeking high-performance materials. This special issue includes fourteen research articles dedicated to the frontiers of high entropy materials, from exploring the microstructures by experiment to revealing the structure-performanc
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