Low activation high entropy alloys for next generation nuclear applications

Materialia ◽  
2018 ◽  
Vol 4 ◽  
pp. 99-103 ◽  
Author(s):  
Aditya Ayyagari ◽  
Riyadh Salloom ◽  
Saideep Muskeri ◽  
Sundeep Mukherjee
Keyword(s):  
High Entropy Alloys ◽  
Next Generation ◽  
High Entropy ◽  
Nuclear Applications

scholarly journals High-Entropy Alloys for Advanced Nuclear Applications

Entropy ◽  
2021 ◽  
Vol 23 (1) ◽  
pp. 98
Author(s):  
Ed J. Pickering ◽  
Alexander W. Carruthers ◽  
Paul J. Barron ◽  
Simon C. Middleburgh ◽  
David E.J. Armstrong ◽  
...  
Keyword(s):  
Austenitic Steels ◽  
Irradiation Damage ◽  
High Entropy Alloys ◽  
Damage Resistance ◽  
High Entropy ◽  
Engineering Alloys ◽  
Sluggish Diffusion ◽  
Work Done ◽  
Current Engineering ◽  
Nuclear Applications

The expanded compositional freedom afforded by high-entropy alloys (HEAs) represents a unique opportunity for the design of alloys for advanced nuclear applications, in particular for applications where current engineering alloys fall short. This review assesses the work done to date in the field of HEAs for nuclear applications, provides critical insight into the conclusions drawn, and highlights possibilities and challenges for future study. It is found that our understanding of the irradiation responses of HEAs remains in its infancy, and much work is needed in order for our knowledge of any single HEA system to match our understanding of conventional alloys such as austenitic steels. A number of studies have suggested that HEAs possess `special’ irradiation damage resistance, although some of the proposed mechanisms, such as those based on sluggish diffusion and lattice distortion, remain somewhat unconvincing (certainly in terms of being universally applicable to all HEAs). Nevertheless, there may be some mechanisms and effects that are uniquely different in HEAs when compared to more conventional alloys, such as the effect that their poor thermal conductivities have on the displacement cascade. Furthermore, the opportunity to tune the compositions of HEAs over a large range to optimise particular irradiation responses could be very powerful, even if the design process remains challenging.

Solid State Manufacture of High Entropy Alloys-Preliminary Studies

MRS Advances ◽  
2017 ◽  
Vol 2 (26) ◽  
pp. 1375-1380 ◽  
Author(s):  
M B D Ellis ◽  
G R Doughty
Keyword(s):  
Solid State ◽  
High Performance ◽  
Alloying Elements ◽  
Liquid Density ◽  
High Entropy Alloys ◽  
Next Generation ◽  
Molten Salt Electrolysis ◽  
High Entropy ◽  
State Diffusion ◽  
Environmentally Friendly Process

AbstractFor the past ten years Metalysis have produced tantalum, titanium and titanium alloy powders for high performance applications using their solid state salt electrolysis process. This low energy and environmentally friendly process is now being used to manufacture the next generation of High Entropy Alloys (HEAs).In most cases the manufacture of HEAs involves high temperatures which put all of the alloying elements into the liquid phase. This can lead to numerous problems and restrict the number of HEAs which can be made, particularly the alloys where one needs to combine low melting point elements with refractory elements and also where there are significant liquid density differences between the constituents causing melt segregation.The aim is to present the preliminary work carried out by Metalysis and to show how the solid state diffusion process based on molten salt electrolysis lends itself to the industrial scale manufacture of the next generation of HEAs. This study will focus on the HEAs whose constituent alloying elements have large differences in both their melting points and liquid densities, for example, chromium, niobium, tantalum, titanium and aluminum.

scholarly journals Short communication: ‘Low activation, refractory, high entropy alloys for nuclear applications’

2019 ◽  
Vol 526 ◽  
pp. 151744 ◽  
Author(s):  
A. Kareer ◽  
J.C. Waite ◽  
B. Li ◽  
A. Couet ◽  
D.E.J. Armstrong ◽  
...  
Keyword(s):  
Short Communication ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Nuclear Applications

Current development of body-centered cubic high-entropy alloys for nuclear applications

Tungsten ◽  
2021 ◽  
Author(s):  
Tan Shi ◽  
Peng-Hui Lei ◽  
Xu Yan ◽  
Jing Li ◽  
Yun-Di Zhou ◽  
...  
Keyword(s):  
High Entropy Alloys ◽  
Body Centered Cubic ◽  
Current Development ◽  
High Entropy ◽  
Nuclear Applications

scholarly journals The atomistic insights of chemical complexity effect on irradiation resistance of high entropy alloys

2022 ◽  
Author(s):  
Lingyun Qian ◽  
Honggang Bao ◽  
Rui Li ◽  
Qing Peng
Keyword(s):  
Nuclear Structure ◽  
Single Phase ◽  
High Entropy Alloys ◽  
Next Generation ◽  
High Entropy ◽  
Chemical Complexity ◽  
High Irradiation ◽  
Irradiation Resistance

High irradiation tolerance is a key feature required for designing the nuclear structure materials for the next generation reactors, where high entropy alloys and equiatomic multicomponent single-phase alloys are good...

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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