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Special Issue Editor

Dr. Chao Yang

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Guest Editor

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: high entropy alloys; high-throughput alloy design; additive manufacturing; powder metallurgy

Special Issue Information

Dear Colleagues,

The advent of high- and medium-entropy alloys (HEAs and MEAs) has broken through the traditional design methodology of alloys and these have been attracting increasing research attention due to their advanced performance and outstanding properties. Recent progress in compositional and structural design concepts, as well as preparation techniques, has further enhanced the performance of HEAs and MEAs, which is included in the scope of this Special Issue. Owing to excellent strength–ductility tradeoff, fracture toughness at ambient and cryogenic temperatures, high temperature capability, tribological performance, irradiation behavior, corrosion/oxidation resistance, etc., HEAs and MEAs have been considered as promising candidates for future applications in a wide range of industries including aerospace, nuclear, marine, biomedical, energy and mining.

In this Special Issue, we welcome review articles and research papers that focus on the advanced performance of HEAs and MEAs and the innovative design methods that lead to such advanced performance. We also aim to shed light on future research. The topics will include, but are not limited to, (1) the various types of HEAs and MEAs, including 3D transitional, refractory, lightweight, single-phase, precipitation-strengthened, eutectic/eutectoid, gradient and bimodal-grained; (2) the various strengthening and plasticity mechanisms, including twining, phase transformation, dispersed particles, nanostructures, dislocation structures, microbands and cell structures; (3) the various advanced design methods, including high-throughput thermodynamics/kinetics calculation and screening, machine learning, molecular dynamics and density functional theory; (4) the various advanced preparation techniques, including arc-melting, powder metallurgy and additive manufacturing for bulk HEAs and MEAs and jet/plasma spraying for HEA and MEA coatings; and (5) the various advanced characterization tools, including 3D atomic probe tomography and in situ transmission electron microscopy.

Dr. Chao Yang
Guest Editor

Manuscript Submission Information

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Keywords

high-entropy alloys
medium-entropy alloys
refractory high-entropy alloys
mechanical performance
computational-aided design
powder metallurgy
additive manufacturing
transformation-induced plasticity
heterostructure

Published Papers (2 papers)

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Research

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14 pages, 12762 KiB

Open AccessArticle

Simulation, Structural, Thermal and Mechanical Properties of the FeTiTaVW High Entropy Alloy

by Ricardo Martins, António Pereira Gonçalves, José Brito Correia, Andrei Galatanu, Eduardo Alves, Elena Tejado, José Ygnacio Pastor and Marta Dias

Metals 2024, 14(4), 436; https://doi.org/10.3390/met14040436 - 08 Apr 2024

Viewed by 492

Abstract

Developing new materials to be applied in extreme environments is an opportunity and a challenge for the future. High entropy alloys are new materials that seem promising approaches to work in nuclear fusion reactors. In this work, FeTaTiVW high entropy alloys were developed and characterized with Molecular Dynamic and Hybrid Molecular Dynamic Monte Carlo simulations. The simulation results show that phase separation originates a lower potential energy per atom and a high level of segregation compared to those of a uniform solid solution. Moreover, the experimental diffractogram of the milled powder shows the formation of a body-centred cubic-type structure and the presence of TiO₂. In addition, the microstructure of the consolidated material evidenced three phases: W-rich, Ti-rich, and a phase with all the elements. This phase separation observed in the microstructure agrees with the Hybrid Molecular Dynamic Monte Carlo simulation. Moreover, the consolidated material’s thermal conductivity and specific heat are almost constant from 25 °C to 1000 °C, and linear expansion increases with increasing temperature. On the other hand, specific heat and thermal expansion values are in between CuCrZr and W values (materials chosen for the reactor walls). The FeTaTiVW high entropy alloy evidences a ductile behaviour at 1000 °C. Therefore, the promising thermal properties of this system can be attributed to the multiple phases and systems with different compositions of the same elements, which is exciting for future developments. Full article

(This article belongs to the Special Issue Advanced Performance of High/Medium Entropy Alloys)

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Review

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17 pages, 9165 KiB

Open AccessReview

A Review of Irradiation-Tolerant Refractory High-Entropy Alloys

by Beiya Wang, Chao Yang, Da Shu and Baode Sun

Metals 2024, 14(1), 45; https://doi.org/10.3390/met14010045 - 29 Dec 2023

Cited by 2 | Viewed by 1199

Abstract

Along with the globalization of environmental problems and the rapid development of the field of nuclear technologies, the severe irradiation damage of materials has become a big issue, restricting the development of advanced nuclear reactor systems. Refractory high-entropy alloys (RHEAs) have the characteristics of a complex composition, a short-range order, and lattice distortion and possess a high phase stability, outstanding mechanical properties, and excellent irradiation resistance at elevated temperatures; thus, they are expected to be promising candidates for advanced nuclear reactors. This review summarizes the design, preparation, and irradiation resistance of irradiation-tolerant RHEAs. It encompasses a comprehensive analysis of various aspects, including the evolution of defects, changes in microstructure, and the degradation in properties. Furthermore, the challenges and insufficiently researched areas regarding these alloys are identified and discussed. Building on this foundation, the review also provides a forward-looking perspective, outlining potential avenues for future research. Full article

(This article belongs to the Special Issue Advanced Performance of High/Medium Entropy Alloys)

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