scholarly journals High Entropy Alloys: Ready to Set Sail?

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 194 ◽  
Author(s):  
Indranil Basu ◽  
Jeff Th. M. De Hosson
Keyword(s):  
Mechanical Response ◽  
High Surface ◽  
Volume Ratio ◽  
Material Design ◽  
Point Of View ◽  
Advanced Materials ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Material Development ◽  
Structural And Functional Properties

Over the past decade, high entropy alloys (HEAs) have transcended the frontiers of material development in terms of their unprecedented structural and functional properties compared to their counterpart conventional alloys. The possibility to explore a vast compositional space further renders this area of research extremely promising in the near future for discovering society-changing materials. The introduction of HEAs has also brought forth a paradigm shift in the existing knowledge about material design and development. It is in this regard that a fundamental understanding of the metal physics of these alloys is critical in propelling mechanism-based HEA design. The current paper highlights some of the critical viewpoints that need greater attention in the future with respect to designing mechanically and functionally advanced materials. In particular, the interplay of large compositional gradients and defect topologies in these alloys and their corresponding impact on overall mechanical response are highlighted. From the point of view of functional response, such chemistry vis-à-vis topology correlations are extended to novel class of nano-porous HEAs that beat thermal coarsening effects despite a high surface to volume ratio owing to retarded diffusion kinetics. Recommendations on material design with regards to their potential use in diverse applications such as energy storage, actuators, and as piezoelectrics are additionally considered.

Microstructural Characterization and Mechanical Properties of Laser Deposited High Entropy Alloys

2014 ◽  
Vol 783-786 ◽  
pp. 2370-2375
Author(s):  
Harihar Sistla ◽  
Joseph W. Newkirk ◽  
F. Frank Liou
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Microstructural Characterization ◽  
Alloy System ◽  
Lattice Parameter ◽  
Laser Deposition ◽  
Advanced Materials ◽  
Mechanical And Thermal Properties ◽  
High Entropy Alloys ◽  
High Entropy

High entropy alloys have attracted great interest due to their flexibility in composition accompanied with very interesting properties, which make these materials candidates for further research. The formation of single solid solution phases as a preference to complex mixtures of intermetallic phases leads to good mechanical and thermal properties. Additive manufacturing in the form of Laser deposition presents us with a very unique way to manufacture near net shape metallic components with advanced materials. The present study focusses on the characterization of High entropy alloys manufactured through laser deposition. The alloy system considered for this study is (AlFeCoCrNi). The ratio of aluminum to nickel was decreased to observe the transition of the solid solution from a BCC structure to a FCC structure. The lattice parameter increased from .288 nm to .357 nm and the hardness decreased from Hv 670 to Hv 149 respectively. The effect of composition on thermodynamic variables, microstructure and mechanical properties were analyzed.

Mechanical response and deformation behavior of Al0.6CoCrFeNi high-entropy alloys upon dynamic loading

2018 ◽  
Vol 727 ◽  
pp. 208-213 ◽  
Author(s):  
L. Wang ◽  
J.W. Qiao ◽  
S.G. Ma ◽  
Z.M. Jiao ◽  
T.W. Zhang ◽  
...  
Keyword(s):  
Dynamic Loading ◽  
Deformation Behavior ◽  
Mechanical Response ◽  
High Entropy Alloys ◽  
High Entropy

Investigation into nanoscratching mechanical response of AlCrCuFeNi high-entropy alloys using atomic simulations

2017 ◽  
Vol 416 ◽  
pp. 470-481 ◽  
Author(s):  
Zining Wang ◽  
Jia Li ◽  
QiHong Fang ◽  
Bin Liu ◽  
Liangchi Zhang
Keyword(s):  
Mechanical Response ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Atomic Simulations

scholarly journals Functionalization and Characterization of Silicon Nanowires for Sensing Applications: A Review

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 999
Author(s):  
Samuel Ahoulou ◽  
Etienne Perret ◽  
Jean-Marie Nedelec
Keyword(s):  
Silicon Nanowires ◽  
Radio Frequency Identification ◽  
Inorganic Compounds ◽  
Silicon Nanowire ◽  
High Surface ◽  
Volume Ratio ◽  
Point Of View ◽  
Sensing Applications ◽  
Frequency Identification

Silicon nanowires are attractive materials from the point of view of their electrical properties or high surface-to-volume ratio, which makes them interesting for sensing applications. However, they can achieve a better performance by adjusting their surface properties with organic/inorganic compounds. This review gives an overview of the main techniques used to modify silicon nanowire surfaces as well as characterization techniques. A comparison was performed with the functionalization method developed, and some applications of modified silicon nanowires and their advantages on those non-modified are subsequently presented. In the final words, the future opportunities of functionalized silicon nanowires for chipless tag radio frequency identification (RFID) have been depicted.

scholarly journals High Entropy Alloys Behaviour During Welding

2001 ◽  
Vol 71 (3) ◽  
pp. 219-233
Author(s):  
Elena Scutelnicu ◽  
George Simion ◽  
Carmen Catalina Rusu ◽  
Marius Corneliu Gheonea ◽  
Ionelia Voiculescu ◽  
...  
Keyword(s):  
Electron Beam Welding ◽  
Chemical Elements ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Advanced Materials ◽  
Technical Solution ◽  
High Entropy Alloys ◽  
Shielded Metal Arc Welding ◽  
High Entropy ◽  
Friction Stir

The High Entropy Alloys have been developed in the last two decades by mixing at least four chemical elements in equiatomic or quasi-equiatomic proportions. Due to the large range of structures and outstanding properties, these advanced materials can be used for structural, high-temperature, wear-resistant, corrosion-resistant, oxidation-resistant, and electrical elements. In order to extend the applicability area of High Entropy Alloys and to improve the knowledge in terms of their behaviour, the researchers worldwide have investigated the phenomena generated by the welding process and its effects produced on their properties. The findings have revealed that these special alloys can be recommended to be used both in high and low-temperature applications. This paper presents a review focused on the weldability and behaviour of CoCrFeMnNi, AlCoCrCuFeNi, AlCrFeCoNi, and CoCrFeNi alloys during Friction Stir Welding, Electron Beam Welding, Laser Beam Welding, and Tungsten Inert Gas. Original results related to the weldability and behaviour of new AlCrFeMnNi alloys developed and subjected to Shielded Metal Arc Welding, as a technical solution for performing morpho-functional structures used in the military field, are presented and discussed, too. The experimental results demonstrated that an appropriate selection of joining technique and filler metal, as well as an optimal combination of process parameters led to performing quality joints, free of defects.

scholarly journals State-of-the-Art Diffusion Studies in the High Entropy Alloys

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 347 ◽  
Author(s):  
Juliusz Dąbrowa ◽  
Marek Danielewski
Keyword(s):  
High Temperature ◽  
Materials Science ◽  
Driving Forces ◽  
State Of The Art ◽  
Point Of View ◽  
High Entropy Alloys ◽  
Diffusion Effect ◽  
High Entropy ◽  
Diffusion Studies ◽  
Sluggish Diffusion

The development of the high entropy alloys (HEAs) is amongst the most important topics in the field of materials science during the last two decades. The concept of multicomponent, near-equimolar systems has been already applied to the number of other systems, including oxides, carbides, diborides, silicides, and it can be expected that other groups of materials will follow. One of the main driving forces for the development of HEAs is the so-called “four core effects”: high entropy effects, severe lattice distortion, cocktail effect, and sluggish diffusion effect. Their existence and extent has been a subject of heated discussion. Probably the least studied of them is the sluggish diffusion effect, which is of the, especially, high importance from the point of view of the most possible applications of HEAs—as high-temperature materials. Its alleged existence carries a promise of obtaining materials with superior mechanical properties, higher creep resistance, and less susceptibility to high-temperature corrosion. In the current review, the state-of-the-art of diffusion studies in HEAs was presented, as well as the resulting conclusions concerning the existence of the sluggish diffusion effect. Based on the literature analysis, it can be stated that there is no experimental evidence, which would support the existence of the sluggish diffusion in HEAs on the level of tracer and self-diffusivities. Nevertheless, it can be pointed out that our current state of knowledge on the diffusion in HEAs is still far from complete; therefore, further directions of studies are proposed.

scholarly journals Review of Recent Research on AlCoCrFeNi High-Entropy Alloy

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1302
Author(s):  
Marzena Tokarewicz ◽  
Małgorzata Grądzka-Dahlke
Keyword(s):  
Mechanical Properties ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Structural And Functional Properties ◽  
Alloying Additives ◽  
Significant Interest ◽  
Component Content ◽  
Alloy Microstructure ◽  
Manufacturing Methods

High-entropy alloys (HEAs) have gained significant interest in recent years because of their outstanding properties. The AlCoCrFeNi alloy is one of the most studied HEAs. The effect of the manufacturing methods and heat treatment on the properties of the high-entropy AlCoCrFeNi alloy is under intense scrutiny. The effect of varying component content on properties of the alloy is frequently analysed. Aluminium is most popular due to its impact on alloy microstructure and occurrence of phases. Research is also conducted on the influence of alloying additives, such as boron and titanium, on the properties of the AlCoCrFeNi alloy. High-entropy alloys also have excellent mechanical properties at high temperatures. Excellent structural and functional properties make them suitable for application in the most demanding conditions. The research conducted on HEAs still provides a lot of new and valuable information on the properties and structures of these alloys. This article summarizes the most important information about HEAs, specifically the AlCoCrFeNi alloy.

scholarly journals Sustainable Coatings on Metallic Alloys as a Nowadays Challenge

2021 ◽  
Vol 13 (18) ◽  
pp. 10217
Author(s):  
Radu Nartita ◽  
Daniela Ionita ◽  
Ioana Demetrescu
Keyword(s):  
Corrosion Inhibitors ◽  
Raw Materials ◽  
Metallic Alloys ◽  
Advanced Materials ◽  
Special Focus ◽  
High Entropy Alloys ◽  
Future Perspectives ◽  
High Entropy ◽  
Green Corrosion Inhibitors ◽  
Selection Of

Starting with a description of the meaning of sustainable coating nowadays, this review presents a selection of methods for sustainable coatings manufacture using raw materials, saving energy and costs. This selection creates an introduction for the coatings performances of intensively investigated coated alloys and their multifunctionality. There are many examples and EU recommendations to be discussed, and we especially chose to introduce sustainable coatings with both industrial and medical functions, such as bioinspired films and coatings on high-entropy alloys, biodegradable metallic alloys, etc. A special focus is on nanotechnology and nanomaterials in green procedures, enhancing coatings’ multifunctionality, introducing green corrosion inhibitors, smart additives, and coatings based on superhydrophobicity. The conclusions and future perspectives of sustainable and multifunctional coatings, as expressions of sustainable advanced materials, are based on important motivations of such studies.

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