High-Entropy Materials A Brief Introduction
This book draws on the latest research to discuss the history and development of high-entropy alloys and ceramics in bulk, film, and fiber form. High-entropy materials have recently been developed using the entropy of mixing and entropy of configuration o
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HighEntropy Materials A Brief Introduction
High-Entropy Materials
Yong Zhang
High-Entropy Materials A Brief Introduction
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Yong Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing, China
ISBN 978-981-13-8525-4 ISBN 978-981-13-8526-1 https://doi.org/10.1007/978-981-13-8526-1
(eBook)
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Preface
Materials are usually categorized by the chemical compositions, e.g., Ti-based alloys, Mg-based alloys, Al-based alloys, and only in recent years, people are beginning to categorize materials according to the configurational entropy of the materials, defined by Boltzmann, S = kLnW, here k is Boltzmann constant, S is configurational entropy, and W is the number of real microstates corresponding to the macrostate. The materials can be called entropic materials, which can include the high-entropy materials (S > 1.61 R, R is the gas constant) and medium-entropy materials (1.61 R > S > 0.69 R). In this book, we briefly introduce the recent development of high-entropy materials, this includes high-entropy metallic alloys (HEAs), high-entropy ceramics, high-entropy films, etc. There are also other names for the high-entropy alloys, e.g., compositional complex alloys (CCAs), complex concentrated alloys (CCAs), and CCAs may contains more materials than HEAs, and all of them can be included in the entropic alloys, or entropic materials (Fig. 1).
Fig. 1 Category of HEAs, CCAs and entropic alloys
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Preface
The high configurational entropy may intend to stabilize the disordered phases, such as random solid solution and amorph
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