scholarly journals Phase transformation and strengthening mechanisms of nanostructured high-entropy alloys

2021 ◽  
Vol 10 (1) ◽  
pp. 1116-1139
Author(s):  
Jinmei Chen ◽  
Xiaosong Jiang ◽  
Hongliang Sun ◽  
Zhenyi Shao ◽  
Yongjian Fang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Performance Optimization ◽  
High Performance ◽  
High Strength ◽  
Easy Access ◽  
High Entropy Alloys ◽  
Strengthening Mechanisms ◽  
Toughening Mechanisms ◽  
High Entropy ◽  
Transition Mechanism

Abstract High-entropy alloys (HEAs) have become a research focus because of their easy access to nanostructures and the characteristics of high strength, hardness, wear resistance, and oxidation resistance, and have been applied in aerospace lightweight materials, ultrahigh temperature materials, high-performance materials, and biomimetic materials. At present, the study of HEAs mainly focuses on the microstructure and mechanical properties. HEAs of Mo, Ti, V, Nb, Hf, Ta, Cr, and W series have high strength, while HEAs of Fe, Co, Ni, Cr, Cu, and Mn series have good toughness. However, the emergence of medium-entropy alloys, metastable HEAs, dual-phase HEAs, and multiphase HEAs increased the complexity of the HEA system, and the phase transition mechanism and strengthening and toughening mechanisms were not fully established. In this article, the preparation, phase formation, phase transformation as well as strengthening and toughening mechanisms of the HEAs are reviewed. The inductive effects of alloying elements, temperature, magnetism, and pressure on the phase transformation were systematically analyzed. The strengthening mechanisms of HEAs are discussed, which provides a reference for the design and performance optimization of HEAs.

scholarly journals Design and Development of High Entropy Alloys Using Artificial Intelligence

2021 ◽  
Author(s):  
Shailesh Kumar Singh ◽  
Vivek K. Singh
Keyword(s):  
Artificial Intelligence ◽  
Material Properties ◽  
High Performance ◽  
High Hardness ◽  
High Strength ◽  
Material Model ◽  
High Entropy Alloys ◽  
Principal Element ◽  
Elevated Temperature Strength ◽  
High Entropy

The conventional design approach of alloys initiates with one principal element and continues by adding several alloying elements to obtain desired properties. In this method, the intrinsic properties of the designed alloy are governed by the principal element. For example, in steel alloy, iron is the principal element, Aluminium in aluminium alloy, and so on. Compared to the conventional alloy, high entropy alloys do not have any dominating elements; all the elements present in these alloys either have an equal or near-equal ratio of elements. As reported in the literature, these alloys exhibit interesting material properties such as high strength, high hardness, improved elevated temperature strength, and magnetic properties. These characteristics make HEAs a suitable option for high-performance applications in the aero engine, aerospace structures, and machine tools. High entropy alloy has multiple principal elements as shown in schematic diagram 1; it leads to much higher possible compositions than conventional alloys. The huge compositional space provides an opportunity to improve desired mechanical properties. If it is explored through “trial and error,” it will be challenging and cumbersome. Therefore, search schemes that can competently and promptly recognize particular alloys with desired properties are essential. Artificial Intelligence is a useful tool to model, discover, and optimize new alloys that enable predicting individual material properties as a function of composition. While the application of Artificial Intelligence is quite popular in many aspects of society, its usage in material informatics is still in the nascent stage. The algorithm used in artificial intelligence is trained to pick up predictive rules from data and create a material model quicker than a computational model and can even generate the model for which no physical model exists. Artificial Intelligence (AI) allows predicting a set of experiments to be conducted to detect new alloy having desired properties. Thus, AI can be used as a valuable tool to optimize the development of new alloys.

High strength dual-phase high entropy alloys with a tunable nanolayer thickness

2019 ◽  
Vol 173 ◽  
pp. 149-153 ◽  
Author(s):  
Z.H. Cao ◽  
Y.J. Ma ◽  
Y.P. Cai ◽  
G.J. Wang ◽  
X.K. Meng
Keyword(s):  
High Strength ◽  
Dual Phase ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Nanolayer Thickness

Novel high-entropy alloys with high-density ε-D019 and abnormal phase transformation

2021 ◽  
Vol 199 ◽  
pp. 113893
Author(s):  
G.H. Xia ◽  
Z.L. Ma ◽  
Z.Q. Xu ◽  
M. Wang ◽  
X.W. Cheng ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Density ◽  
High Entropy Alloys ◽  
High Entropy

Probing the phase transformation and dislocation evolution in dual-phase high-entropy alloys

2019 ◽  
Vol 114 ◽  
pp. 161-173 ◽  
Author(s):  
Qihong Fang ◽  
Yang Chen ◽  
Jia Li ◽  
Chao Jiang ◽  
Bin Liu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Dual Phase ◽  
High Entropy Alloys ◽  
High Entropy

Effect of Si element on phase transformation and mechanical properties for FeCoCrNiSix high entropy alloys

2021 ◽  
Vol 282 ◽  
pp. 128809
Author(s):  
Lei Huang ◽  
Xuejie Wang ◽  
Fuchao Jia ◽  
Xingchuan Zhao ◽  
Baoxu Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
High Entropy Alloys ◽  
High Entropy

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 Achieving high strength and ductility in nitrogen-doped refractory high-entropy alloys

2021 ◽  
pp. 110356
Author(s):  
Ruixin Wang ◽  
Yu Tang ◽  
Zhifeng Lei ◽  
Yuanlin Ai ◽  
Zhixing Tong ◽  
...  
Keyword(s):  
High Strength ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Nitrogen Doped ◽  
Strength And Ductility
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