High Entropy Alloys: From Bulk Metallic Materials to Nanoparticles

2018 ◽  
Vol 49 (10) ◽  
pp. 4986-4990 ◽  
Author(s):  
Qingfeng Wu ◽  
Zhijun Wang ◽  
Feng He ◽  
Lilin Wang ◽  
Jie Luo ◽  
...  
Keyword(s):  
High Entropy Alloys ◽  
Metallic Materials ◽  
High Entropy

scholarly journals HIGH-ENTROPY ALLOYS AS A PROSPECTIVE CLASS OF NEW RADIATION-TOLERANT MATERIALS RESEARCH DEVELOPMENT ANALYSIS BASED ON THE INFORMATION DATABASES

2021 ◽  
pp. 3-15
Author(s):  
A.V. Levenets ◽  
M.A. Tikhonovsky ◽  
V.N. Voyevodin ◽  
A.G. Shepelev ◽  
O.V. Nemashkalo
Keyword(s):  
Radiation Damage ◽  
Exponential Growth ◽  
High Entropy Alloys ◽  
Research Development ◽  
Metallic Materials ◽  
High Entropy ◽  
New Class ◽  
Materials Research ◽  
Development Analysis ◽  
Radiation Tolerant

A new class of metallic materials, so-called “high-entropy alloys” (HEAs), was under review. Various definitions of these alloys are given, their main differences from the conventional alloys are indicated and the dynamics of publications in the period from the first publications in 2004 to the end of 2020 are presented. It is noted the almost exponential growth of the article numbers concerning these alloys, and the main reasons of such high interest are discussed. Experimental results of development the radiation-tolerant materials based on the concept of high-entropy alloys and study of the radiation damage mechanisms are summarised.

scholarly journals High Entropy Alloys Manufactured by Additive Manufacturing

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 639 ◽  
Author(s):  
José M. Torralba ◽  
Mónica Campos
Keyword(s):  
Additive Manufacturing ◽  
Review Paper ◽  
Physical Metallurgy ◽  
High Entropy Alloys ◽  
Metallic Materials ◽  
Processing Conditions ◽  
High Entropy ◽  
New Material ◽  
Manufacturing Technologies ◽  
Structure And Microstructure

High entropy alloys have attracted much interest over the last 16 years due to their promising an unusual properties in different fields that offer many new possible application. Additionally, additive manufacturing has drawn attention due to its versatility and flexibility ahead of a new material challenge, being a suitable technology for the development of metallic materials. Moreover, high entropy alloys have demonstrated that many gaps exist in the literature on its physical metallurgy, and in this sense, additive manufacturing could be a feasible technology for solving many of these challenges. In this review paper the newest literature on this topic is condensed into three different aspects: the different additive manufacturing technologies employed to process high entropy alloys, the influence of the processing conditions and composition on the expected structure and microstructure and information about the mechanical and corrosion behavior of these alloys.

scholarly journals Elaboration of Metallic Materials by SPS: Processing, Microstructures, Properties, and Shaping

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 322
Author(s):  
Jean-Philippe Monchoux ◽  
Alain Couret ◽  
Lise Durand ◽  
Thomas Voisin ◽  
Zofia Trzaska ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Metallic Glasses ◽  
Rapid Heating ◽  
High Entropy Alloys ◽  
Metallic Materials ◽  
Powder Metallurgy Technique ◽  
High Entropy ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Near Net Shape

After a few decades of increasing interest, spark plasma sintering (SPS) has now become a mature powder metallurgy technique, which allows assessing its performances toward fabricating enhanced materials. Here, the case of metals and alloys will be presented. The main advantage of SPS lies in its rapid heating capability enabled by the application of high intensity electric currents to a metallic powder. This presents numerous advantages balanced by some limitations that will be addressed in this review. The first section will be devoted to sintering issues, with an emphasis on the effect of the electric current on the densification mechanisms. Then, typical as-SPS microstructures and properties will be presented. In some cases, they will be compared with that of materials processed by conventional techniques. As such, examples of nanostructured materials, intermetallics, metallic glasses, and high entropy alloys, will be presented. Finally, the implementation of SPS as a technique to manufacture complex, near-net shape industrial parts will be discussed.

High Mixing Entropy Alloys Design with High Anticorrosion and Wear-Resistance Properties

2013 ◽  
Vol 815 ◽  
pp. 19-24
Author(s):  
Sheng Zhu ◽  
Wen Bo Du ◽  
Xiao Ming Wang ◽  
Guo Feng Han
Keyword(s):  
Simple Structure ◽  
High Entropy Alloy ◽  
Anticorrosion Property ◽  
High Entropy Alloys ◽  
Metallic Materials ◽  
Corrosion Resistant ◽  
High Entropy ◽  
Entropy Effect ◽  
New Type ◽  
Principal Elements

High entropy alloys emerge as a new type of advanced metallic materials, which have received increasing attentions from material engineers around the world. In addition to high entropy effect based on equiatomic or near-equiatomic and containing five or more principal elements, they exhibit a cocktail effect resulting from interactions among all the elements and the indirect effects of the various elements on the performances. In this study, according to high entropy alloy design principles, corrosion-resistant elements such as Al, Ni, Cr and Mo were used to improve the anticorrosion property, Fe, Co, B and Si as solid solution elements were added to promote the formation of solid solutions with simple structure, and the wear-resisting property increased.

New High Entropy Alloy for Biomedical Applications

2017 ◽  
Vol 750 ◽  
pp. 180-183 ◽  
Author(s):  
Brandusa Ghiban ◽  
Gabriela Popescu ◽  
Daniela Dumitrescu ◽  
Vasile Soare
Keyword(s):  
Biomedical Applications ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Metallic Materials ◽  
Corrosion Properties ◽  
High Entropy ◽  
New Class ◽  
Potential Applications ◽  
High Degree ◽  
Oxidation And Corrosion

High Entropy Alloys (HEAs) represent a new concept of metallic materials, that contain 5 or more elements, in proportions from 5 at.% to 35 at.%, and form simple solid solutions (BCC and/or FCC) instead of complicated intermetallic phases. The high degree of randomness atomic HEA, gives them excellent properties: electrical, mechanical, electrochemical, ductility, anti-corrosion properties, stable structure etc, with applications in peak thus representing a growing research. These specific features provides HEA with excellent hardness, strength and wear strength, malleability, oxidation and corrosion resistance, with potential applications in diverse industrial areas [1÷4]. Considering these properties we decide to improve biomedical alloys with this new class of HEAs.

High-Entropy Alloys as Catalysts for the CO2 and CO Reduction Reactions

2019 ◽  
Author(s):  
Jack Pedersen ◽  
Thomas Batchelor ◽  
Alexander Bagger ◽  
Jan Rossmeisl
Keyword(s):  
Density Functional ◽  
Rational Design ◽  
Hydrogen Adsorption ◽  
Co Adsorption ◽  
Reduction Reaction ◽  
Supervised Machine Learning ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Co Reduction ◽  
Disordered Alloy

Using the high-entropy alloys (HEAs) CoCuGaNiZn and AgAuCuPdPt as starting points we provide a framework for tuning the composition of disordered multi-metallic alloys to control the selectivity and activity of the reduction of carbon dioxide (CO2) to highly reduced compounds. By combining density functional theory (DFT) with supervised machine learning we predicted the CO and hydrogen (H) adsorption energies of all surface sites on the (111) surface of the two HEAs. This allowed an optimization for the HEA compositions with increased likelihood for sites with weak hydrogen adsorption{to suppress the formation of molecular hydrogen (H2) and with strong CO adsorption to favor the reduction of CO. This led to the discovery of several disordered alloy catalyst candidates for which selectivity towards highly reduced carbon compounds is expected, as well as insights into the rational design of disordered alloy catalysts for the CO2 and CO reduction reaction.

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