Open access peer-reviewed Edited Volume

Advances in High-Entropy Alloys - Materials Research, Exotic Properties and Applications

Jiro Kitagawa

Fukuoka Institute of Technology

A pioneering researcher in rare-earth intermetallic compounds and high-entropy alloy superconductors, and also a holder of two registered patents. Dr. Kitagawa received his Ph.D. degree from the University of Tokyo and was a research associate affiliated with Hiroshima University for ten years before joining Fukuoka Institute of Technology.

Covering

Metallurgy Microstructure Machine Learning CALPHAD High Strength Good Thermal Stability Superconductivity Magnetism Coating Biomaterials Catalysts Magnetic Refrigeration Materials

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About the book

High-entropy alloy (HEA) is a new class of materials characterized by the crystal in which more than five elements with the atomic fraction of each component between 5% and 35% randomly occupy one crystallographic site. The concept of HEA has initially developed in the single-site crystal structures such as face-centered-cubic (fcc), body-centered-cubic (bcc), and hexagonal-closed packing (hcp), however, is now adopted in many multi-site alloys (multi-site HEAs). Due to the severe lattice distortion effect, many fcc or bcc HEAs show superior mechanical properties, which attract researchers all over the world. The superior mechanical properties result from the cocktail effect, which means an enhancement of property beyond the simple mixture of those of constituent elements. The cocktail effect is also observed in a multi-site HEA: for example, outstanding thermal stability or enhancement of magnetic frustration in a high-entropy alloyed oxide. Due to the massive elemental combination of the HEA system, there are unlimited possibilities of finding new phenomena in the materials research on HEAs. The conventional metallurgical study for bulk HEA is significant steady work in not only the single-phase sample but also the multiphase sample such as eutectic HEA. In addition, fabrications of thin film and nanocrystalline samples of well-known HEAs are important works. It is widely accepted that first-principle calculations, machine learning, and CALPHAD (calculation of phase diagram) are powerful methods for screening new compounds. Very interesting topics concerning the mechanical, physical and chemical properties are new HEAs showing high strength, high ductility, good thermal stability, refractory, superconductivity, exotic magnetism, and so on. The topics concerning applications are also interesting, for example, coating against the corrosion, biomaterials, catalysts, shape memory alloys, magnetic refrigeration materials, and so on.

This book intends to provide the reader with a comprehensive overview of the frontier of materials research, exotic properties (mechanical, physical, chemical et al.), and exciting applications in HEAs.

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About the editor

Jiro Kitagawa

Fukuoka Institute of Technology

Dr. Kitagawa received the B.S. degree in physics from Kyoto University, Japan in 1993, and the M.S. and Ph.D. degrees in physics from the University of Tokyo, Japan in 1995 and 1998, respectively. At the University of Tokyo, he carried out materials research on rare-earth intermetallic compounds showing quadrupolar orderings. In 2002 he joined Hiroshima University, Japan as a research associate. He was then engaged in the study of material properties using the terahertz (THz) time-domain spectroscopic method and the development of THz devices. In 2012 he joined Fukuoka Institute of Technology, Japan: from 2012 to 2014 as an associate professor, and from 2015 as a professor. His research interests include materials research on magnetic and superconducting materials. The current projects are magnetism and superconductivity in high-entropy alloys and chemical control of the magnetic state in a compound with a complex crystal structure.

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