Effect of Enhanced Gravity on the Microstructure and Mechanical Properties of Al0.9CoCrFeNi High-Entropy Alloy

Shi, Anjun; Li, Ruixuan; Zhang, Yong; Wang, Zhe; Guo, Zhen

doi:10.3390/e22111318

Cited by 3 publications

(2 citation statements)

References 37 publications

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“…The effect of better performance enhancement was obtained, but the modulus was still relatively small compared to the other two alloys. The highest hardness was obtained for the CuCrWMoC alloy, and the conclusion that the addition of C enhances the hardness of the HEAs is consistent with the literature [34–36].…”

Section: Resultssupporting

confidence: 90%

First‐Principles Calculations for the Enhancement of Mechanical Properties of High‐Entropy Alloys by Carbon Elements

Ding

Feng

Yuan

2023

IEEJ Transactions Elec Engng

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A series of alloy solid solution models were developed using the SQS modeling method, and the effect of C doping on the phase structure, elastic properties, and electronic structure of the alloys was investigated using a first‐principles approach. The results showed that the CuCrWNi (C), CuCrWMo (C), and CuCrWAl (C) alloys all have a single body‐centered cubic (BCC) structure. The alloys conformed to the mechanical stability criterion before and after incorporating C. The incorporation of C leads to an increase in the bulk modulus B of the CuCrWNi, CuCrWAl alloy, and the Young's modulus E and shear modulus G of the CuCrWMo, CuCrWAl alloy. In comparison, the shear modulus G and Young's modulus E of CuCrWNi alloy and the bulk modulus B of CuCrWMo alloy show a decreasing tendency. The alloy is ductile before and after the addition of C. The addition of C increased the Poisson's ratio, Pugh ratio, and Cauchy pressure of CuCrWNi alloy and decreased the Poisson's ratio, Pugh ratio, and Cauchy pressure of CuCrWMo and CuCrWAl. This shows that adding C improves the ductility of CuCrWNi and the strength of CuCrWMo and CuCrWAl alloys. By analyzing the electronic structure of the alloys, it was found that the doping of C made the alloy less stable. Adding C makes the high‐entropy alloys more conducive and the metallic properties more noticeable. Moreover, the incorporation of C makes the CuCrWNi pseudo‐energy gap decrease and the CuCrWMo, and CuCrWAl pseudo‐energy gap increase, which may be related to the change in the mechanical properties of the alloy. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Section: Resultssupporting

confidence: 90%

First‐Principles Calculations for the Enhancement of Mechanical Properties of High‐Entropy Alloys by Carbon Elements

Ding

Feng

Yuan

2023

IEEJ Transactions Elec Engng

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“…Although the supergravity-induced grain refinement phenomenon has been confirmed in different materials [8][9][10][11], the underlying mechanism is still an open question. To explain the observed phenomena, several theories have been proposed, including the nucleation rate rise theory [12], dendrite fragmentation theory [4,7] and 'crystal rain' theory [5].…”

Section: Introductionmentioning

confidence: 99%

The motion and growth behaviors of nucleuses in Al melt solidified under supergravity condition—molecular dynamics simulation

Gan

Huang

2023

Mater. Res. Express

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That supergravity can refine grains is verified in many materials. However, the underlying mechanism is still an open question. Although some convincing theories have been proposed, including the "crystal rain" theory and the dendrite fragmentation theory, there is a lack of solid evidence, especially from the atomic scale. Based on the presetting nucleuses method, this study investigates the motion and growth behaviors of nucleuses during the solidification process of Al melt under supergravity condition with molecular dynamics simulation. It is found that supergravity builds a gradient pressure in the samples along the direction of supergravity, and the gradient pressure results in the gradient distribution of sample density. The preset nucleuses move directionally along the direction of supergravity forming "crystal rain", while their directional moving velocity decreases due to the increase of buoyancy, which is caused by the increase of melt density in the motion path of the nucleuses. The supergravity-induced pressure not only decreases the critical size of nucleuses but also increases the growth velocity of nucleuses. The research results also indicate that larger nucleuses grow much faster than smaller ones at the same pressure. Owing to the gradient distribution of pressure, the nucleuses grow much faster along the direction of supergravity than other directions and evolve into an “inverted cone” shape. Therefore, these findings show that supergravity can change the nucleation, motion and growth of nucleuses by establishing a gradient pressure in the melt, thus affecting the microstructure of the casting. Our results provide solid support for the “crystal rain” theory and the nucleation rate rising theory from atomic scale.

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Effect of Super-Gravity Field on the Purification and Solidification Structure of Oxygen-Free Copper (OFC)

Wang,

Lan,

Wang

et al. 2024

The Minerals, Metals &Amp; Materials Series

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Effect of Enhanced Gravity on the Microstructure and Mechanical Properties of Al0.9CoCrFeNi High-Entropy Alloy

Cited by 3 publications

References 37 publications

First‐Principles Calculations for the Enhancement of Mechanical Properties of High‐Entropy Alloys by Carbon Elements

First‐Principles Calculations for the Enhancement of Mechanical Properties of High‐Entropy Alloys by Carbon Elements

The motion and growth behaviors of nucleuses in Al melt solidified under supergravity condition—molecular dynamics simulation

Effect of Super-Gravity Field on the Purification and Solidification Structure of Oxygen-Free Copper (OFC)

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