scholarly journals Effect of Al content on the oxidation behavior of Y/Hf-doped AlCoCrFeNi high-entropy alloy

2020 ◽  
Vol 170 ◽  
pp. 108691 ◽  
Author(s):  
Jie Lu ◽  
Ying Chen ◽  
Han Zhang ◽  
Ling Li ◽  
Liming Fu ◽  
...  
Keyword(s):  
Oxidation Behavior ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Al Content

scholarly journals Generalized Stacking Fault Energy of Al-Doped CrMnFeCoNi High-Entropy Alloy

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 59 ◽  
Author(s):  
Xun Sun ◽  
Hualei Zhang ◽  
Wei Li ◽  
Xiangdong Ding ◽  
Yunzhi Wang ◽  
...  
Keyword(s):  
Interfacial Energy ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Al Content ◽  
Generalized Stacking Fault ◽  
Generalized Stacking Fault Energy

Using first-principles methods, we investigate the effect of Al on the generalized stacking fault energy of face-centered cubic (fcc) CrMnFeCoNi high-entropy alloy as a function of temperature. Upon Al addition or temperature increase, the intrinsic and extrinsic stacking fault energies increase, whereas the unstable stacking fault and unstable twinning fault energies decrease monotonously. The thermodynamic expression for the intrinsic stacking fault energy in combination with the theoretical Gibbs energy difference between the hexagonal close packed (hcp) and fcc lattices allows one to determine the so-called hcp-fcc interfacial energy. The results show that the interfacial energy is small and only weakly dependent on temperature and Al content. Two parameters are adopted to measure the nano-twinning ability of the present high-entropy alloys (HEAs). Both measures indicate that the twinability decreases with increasing temperature or Al content. The present study provides systematic theoretical plasticity parameters for modeling and designing high entropy alloys with specific mechanical properties.

scholarly journals Microstructure Evolution and Properties of Laser Cladding CoCrFeNiTiAlx High-Entropy Alloy Coatings

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 373 ◽  
Author(s):  
Yiku Xu ◽  
Zhiyuan Li ◽  
Jianru Liu ◽  
Yongnan Chen ◽  
Fengying Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Laser Cladding ◽  
Laves Phase ◽  
High Entropy Alloy ◽  
Body Centered Cubic ◽  
Phase Constitution ◽  
High Entropy ◽  
Al Content ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance

High-entropy alloy (HEA) coatings of CoCrFeNiTiAlx (x = 0, 0.5, 1, 1.5, 2) were prepared on the surface of AISI1045 steel by laser cladding. The effects of the Al content on the microstructure, composition, phase constitution, and wear and corrosion resistance of the coatings were investigated. The results showed that when increasing the Al element content from 0 to 0.5, the phase constitution of the CoCrFeNiTiAlx coating changed from a single Face-centered cubic (FCC) phase to Body-centered cubic 1 (BCC1) and Body-centered cubic 2 (BCC2) phases, with a small amount of Laves phase, which obviously improved the friction and corrosion resistance of the coating. With further enhancing of the Al content, the amount of BCC1 phase increased, while the BCC2 phase and the Laves phase decreased. The CoCrFeNiTiAl2 HEA coating transformed into a single BCC1 phase, with retrogressive wear and corrosion resistance. It was found that the Al0.5 alloy coating exhibits excellent wear resistance, high hardness, and corrosion resistance in a 3.5 wt.% NaCl solution. Furthermore, the effect of the Al content on the microstructure, phase, and the relating properties of the CoCrFeNiTiAlx HEA coatings is also discussed.

Microstructure of Al1.3CrFeNi eutectic high entropy alloy and oxidation behavior at 1000 °C

2017 ◽  
Vol 32 (11) ◽  
pp. 2109-2116 ◽  
Author(s):  
Xiao Chen ◽  
Yanwei Sui ◽  
Jiqiu Qi ◽  
Yezeng He ◽  
Fuxiang Wei ◽  
...  
Keyword(s):  
Oxidation Behavior ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Image Position

Abstract

Microstructure, mechanical and thermal oxidation behavior of AlNbTiZr high entropy alloy

2018 ◽  
Vol 100 ◽  
pp. 9-19 ◽  
Author(s):  
J. Jayaraj ◽  
Pramote Thirathipviwat ◽  
Junhee Han ◽  
Annett Gebert
Keyword(s):  
Thermal Oxidation ◽  
Oxidation Behavior ◽  
High Entropy Alloy ◽  
High Entropy
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