Influence of alloying elements on mechanical and electronic properties of NbMoTaWX (X = Cr, Zr, V, Hf and Re) refractory high entropy alloys

2020 ◽  
Vol 126 ◽  
pp. 106928
Author(s):  
Yonggang Tong ◽  
Linhui Bai ◽  
Xiubing Liang ◽  
Yongxiong Chen ◽  
Zhibing Zhang ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Alloying Elements ◽  
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 Effect of Sn and Mo on Microstructure and Electrochemical Property of TiZrTaNb High Entropy Alloys

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1527
Author(s):  
Qiaoyu Li ◽  
Tengfei Ma ◽  
Yuliang Jin ◽  
Xiaohong Wang ◽  
Duo Dong ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Dendritic Structure ◽  
Optical Microscope ◽  
Alloying Elements ◽  
High Entropy Alloy ◽  
Corrosion Mechanism ◽  
High Entropy Alloys ◽  
Corrosion Properties ◽  
Corrosion Morphology ◽  
High Entropy

The effects of Sn and Mo alloying elements on the microstructure and electrochemical properties of TiZrTaNb high entropy alloys were studied by optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemistry. TiZrTaNb, TiZrTaNbMo and TiZrTaNbSn alloys with equal atomic ratio were prepared by the arc melting method. The results showed that the microstructure of the high entropy alloys was dendritic structure with single BCC structure. The addition of Mo and Sn elements promoted the growth of the dendritic structure and accelerated the interdendritic segregation of the TiZrTaNb alloy. The TiZrTaNbMo alloy exhibited excellent corrosion properties compared to TiZrTaNb and TiZrTaNbSn alloys based on corrosion parameters Icorr, φcorr, Ipass. The corrosion mechanism is discussed based on the corrosion morphology. The alloying elements have an important effect on the microstructure and electrochemical properties of a high entropy alloy.

scholarly journals High-temperature martensitic transformation of CuNiHfTiZr high- entropy alloys

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Shan-Hsiu Chang ◽  
Po-Ting Lin ◽  
Che-Wei Tsai
Keyword(s):  
High Temperature ◽  
Martensitic Transformation ◽  
Shape Memory ◽  
Structural Evolution ◽  
Alloying Elements ◽  
High Entropy Alloys ◽  
X Ray Diffraction ◽  
High Entropy ◽  
High Transformation ◽  
Niti Shape Memory Alloys

AbstractOne of the major challenges of near-equiatomic NiTi shape memory alloys is their limitation for high-temperature applications. To overcome this barrier, researchers have tried to enhance the transformation temperatures by addition of alloying elements or even by introducing the concept of high-entropy alloys (HEAs). In this study, the CuNiHfTiZr HEAs were developed for high-temperature shape memory effect. Based on their solubility and electron configurations, the alloying elements are divided into two groups, (CuNi)50 and (HfTiZr)50. The content of Cu in (CuNi)50 is modulated to investigate the influences of Cu on martensitic transformation of the HEAs by studying structural evolution and transformation behavior. The results of x-ray diffraction and thermal expansion tests revealed that Cu15Ni35Hf16.67Ti16.67Zr16.67 possesses high transformation temperature, narrow hysteresis temperature loops, and good dimensional stability within this HEA system.

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