scholarly journals Self-Similar Random Process and Chaotic Behavior In Serrated Flow of High Entropy Alloys

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Shuying Chen ◽  
Liping Yu ◽  
Jingli Ren ◽  
Xie Xie ◽  
Xueping Li ◽  
...  
Keyword(s):  
Random Process ◽  
Chaotic Behavior ◽  
High Entropy Alloys ◽  
Serrated Flow ◽  
High Entropy ◽  
Self Similar

scholarly journals A Review of the Serrated-Flow Phenomenon and Its Role in the Deformation Behavior of High-Entropy Alloys

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1101 ◽  
Author(s):  
Jamieson Brechtl ◽  
Shuying Chen ◽  
Chanho Lee ◽  
Yunzhu Shi ◽  
Rui Feng ◽  
...  
Keyword(s):  
Strain Rate ◽  
Complexity Analysis ◽  
Flow Behavior ◽  
Dynamical Behavior ◽  
Future Research ◽  
High Entropy Alloys ◽  
Material System ◽  
Experimental Conditions ◽  
Serrated Flow ◽  
High Entropy

High-entropy alloys (HEAs) are a novel class of alloys that have many desirable properties. The serrated flow that occurs in high-entropy alloys during mechanical deformation is an important phenomenon since it can lead to significant changes in the microstructure of the alloy. In this article, we review the recent findings on the serration behavior in a variety of high-entropy alloys. Relationships among the serrated flow behavior, composition, microstructure, and testing condition are explored. Importantly, the mechanical-testing type (compression/tension), testing temperature, applied strain rate, and serration type for certain high-entropy alloys are summarized. The literature reveals that the serrated flow can be affected by experimental conditions such as the strain rate and test temperature. Furthermore, this type of phenomenon has been successfully modeled and analyzed, using several different types of analytical methods, including the mean-field theory formalism and the complexity-analysis technique. Importantly, the results of the analyses show that the serrated flow in HEAs consists of complex dynamical behavior. It is anticipated that this review will provide some useful and clarifying information regarding the serrated-flow mechanisms in this material system. Finally, suggestions for future research directions in this field are proposed, such as the effects of irradiation, additives (such as C and Al), the presence of nanoparticles, and twinning on the serrated flow behavior in HEAs.

Microstructures, tensile properties and serrated flow of Al CrMnFeCoNi high entropy alloys

2020 ◽  
Vol 30 (3) ◽  
pp. 746-755
Author(s):  
Jun XU ◽  
Cheng-ming CAO ◽  
Ping GU ◽  
Liang-ming PENG
Keyword(s):  
Tensile Properties ◽  
High Entropy Alloys ◽  
Serrated Flow ◽  
High Entropy

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.

Effect of the structure of vacuum condensates of high entropy alloys of Cr–Fe–Co–Ni–Cu system on their mechanical properties

2020 ◽  
Vol 2020 (4) ◽  
pp. 16-22
Author(s):  
A.I. Ustinov ◽  
◽  
V.S. Skorodzievskii ◽  
S.A. Demchenkov ◽  
S.S. Polishchuk ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Vacuum Condensates

Computational Approach to Predict Phase Fraction in Dual-Phase High Entropy Alloys

2019 ◽  
Author(s):  
Ankit Singh Negi ◽  
Ayush Sourav ◽  
T. Shanmugasundaram
Keyword(s):  
Computational Approach ◽  
Phase Fraction ◽  
Dual Phase ◽  
High Entropy Alloys ◽  
High Entropy

Local Lattice Distortion and Chemical Short Range Order in High Entropy Alloys

2020 ◽  
Author(s):  
Yuan-Yuan Tan ◽  
Ming-Yao Su ◽  
Zhou-Can Xie ◽  
Zhong-Jun Chen ◽  
Yu Gong ◽  
...  
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Lattice Distortion ◽  
Range Order ◽  
High Entropy Alloys ◽  
Local Lattice Distortion ◽  
High Entropy ◽  
Local Lattice
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