Nanocrystalline High-Entropy Alloys: A New Paradigm in High-Temperature Strength and Stability

Nano Letters ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. 1569-1574 ◽  
Author(s):  
Yu Zou ◽  
Jeffrey M. Wheeler ◽  
Huan Ma ◽  
Philipp Okle ◽  
Ralph Spolenak
Keyword(s):  
High Temperature ◽  
High Temperature Strength ◽  
High Entropy Alloys ◽  
New Paradigm ◽  
High Entropy

Enhanced High-Temperature Strength of HfNbTaTiZrV Refractory High-Entropy Alloys by AI 2O 3 Reinforcement

2021 ◽  
Author(s):  
Bingjie Wang ◽  
Qianqian Wang ◽  
Nan Lu ◽  
Bo Sun ◽  
Xiubing Liang ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Strength ◽  
High Entropy Alloys ◽  
High Entropy

Fundamental Core Effects in Transition Metal High-Entropy Alloys: “High-Entropy” and “Sluggish Diffusion” Effects

2021 ◽  
Vol 29 ◽  
pp. 75-93
Author(s):  
Abhishek Mehta ◽  
Yong Ho Sohn
Keyword(s):  
High Temperature ◽  
Temperature Stability ◽  
High Temperature Strength ◽  
High Entropy Alloys ◽  
High Temperature Stability ◽  
High Entropy ◽  
Diffusion Effects ◽  
Initial Work ◽  
Entropy Effect ◽  
Sluggish Diffusion

High entropy alloys (HEAs) are equimolar multi-principal-element alloys (MPEAs) that are different from traditional solvent-based multicomponent alloys based on the concept of alloy design. Based on initial work by Yeh and co-workers, HEAs were postulated to exhibit four “core” effects: high entropy, sluggish diffusion, lattice distortion, and cocktail effect. Out of these four proposed core effects, “high entropy” and “sluggish diffusion” effects were most debated in the literature as these core effects directly affect the thermodynamic and kinetic understanding of HEAs. The initial work on HEAs by several researchers utilized these effects to indirectly support the experimentally observed “unique” properties, without independent investigation of these core effects. The presumed implications of these core effects resulted in justification or generalization of properties to all HEAs, e.g., all HEAs should exhibit high temperature stability based on high entropy effect, high temperature strength owing to limited grain growth, good diffusion barrier application due to sluggish diffusion kinetics, etc. However, many recent studies have challenged these core effects, and suggested that not all HEAs were observed to exhibit these core effects.

scholarly journals A Review of the Latest Developments in the Field of Refractory High-Entropy Alloys

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 612
Author(s):  
Muthe Srikanth ◽  
A. Raja Annamalai ◽  
A. Muthuchamy ◽  
Chun-Ping Jen
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Oxidation Resistance ◽  
Strengthening Mechanism ◽  
High Temperature Strength ◽  
High Entropy Alloys ◽  
Temperature Oxidation ◽  
High Entropy ◽  
Refractory Elements ◽  
Insight Into

This review paper provides insight into current developments in refractory high-entropy alloys (RHEAs) based on previous and currently available literature. High-temperature strength, high-temperature oxidation resistance, and corrosion resistance properties make RHEAs unique and stand out from other materials. RHEAs mainly contain refractory elements like W, Ta, Mo, Zr, Hf, V, and Nb (each in the 5–35 at% range), and some low melting elements like Al and Cr at less than 5 at%, which were already developed and in use for the past two decades. These alloys show promise in replacing Ni-based superalloys. In this paper, various manufacturing processes like casting, powder metallurgy, metal forming, thin-film, and coating, as well as the effect of different alloying elements on the microstructure, phase formation, mechanical properties and strengthening mechanism, oxidation resistance, and corrosion resistance, of RHEAs are reviewed.

The role of Si on microstructure and high-temperature oxidation of CoCr2FeNb0.5Ni high-entropy alloys coating

2021 ◽  
pp. 109417
Author(s):  
Minyu Ma ◽  
Aihua Han ◽  
Zunjun Zhang ◽  
Yong Lian ◽  
Chao Zhao ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
High Entropy Alloys ◽  
Temperature Oxidation ◽  
High Entropy

scholarly journals Analysis of the high-temperature dry sliding behavior of CoCrFeNiTi0.5Alx high-entropy alloys

Friction ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 198-207 ◽  
Author(s):  
Azmi Erdoğan ◽  
Mustafa Sabri Gök ◽  
Sakin Zeytin
Keyword(s):  
High Temperature ◽  
Dry Sliding ◽  
High Entropy Alloys ◽  
High Entropy

A review on fundamental of high entropy alloys with promising high–temperature properties

2018 ◽  
Vol 760 ◽  
pp. 15-30 ◽  
Author(s):  
Jian Chen ◽  
Xueyang Zhou ◽  
Weili Wang ◽  
Bing Liu ◽  
Yukun Lv ◽  
...  
Keyword(s):  
High Temperature ◽  
High Entropy Alloys ◽  
High Temperature Properties ◽  
High Entropy
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