Imposition of electric current to promote the Portevin-Le Chatelier effect of CoCrFeMnNi high-entropy alloy at low temperatures

Yafei Wang; Liu Xia; Yitao Cao; Hongjie Zhang; Zhonghu Hao; Weichao Wu

doi:10.1016/j.msea.2020.139893

Imposition of electric current to promote the Portevin-Le Chatelier effect of CoCrFeMnNi high-entropy alloy at low temperatures

Yafei Wang, Liu Xia, Yitao Cao, Hongjie Zhang, Zhonghu Hao, Weichao Wu^*

^*Corresponding author for this work

School of Mechatronical Engineering

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

The effect of electric current on Portevin-Le Chatelier (PLC) effect of CoCrFeMnNi high-entropy alloy (HEA) was investigated. Compared with previous studies, PLC effects were firstly observed at much lower temperatures than 275 °C. Theoretical analysis based on the experimental results indicates that the electromigration effect and the increased concentration of vacancies induced by electric current can significantly improve the mobility of solute atoms in CoCrFeMnNi HEA. Together with the increased dislocation density, the enhanced mobility of solute atoms can facilitate the repeated locking and unlocking process of mobile dislocations by the solutes during plastic deformation process. Consequently, this leads to the promoted PLC effect at lower temperatures, which is also supported by TEM analysis and the estimated higher activation energy of 285.4 kJ mol⁻¹ between 275 °C and 325 °C.

Original language	English
Article number	139893
Journal	Materials Science and Engineering: A
Volume	793
DOIs	https://doi.org/10.1016/j.msea.2020.139893
Publication status	Published - 19 Aug 2020

Keywords

Electric current
High-entropy alloy
Low temperatures
Portevin-Le Chatelier effect
Serration behavior

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10.1016/j.msea.2020.139893

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@article{3ac7d6a9d1ef4cad9c5bbe774e99cc9c,

title = "Imposition of electric current to promote the Portevin-Le Chatelier effect of CoCrFeMnNi high-entropy alloy at low temperatures",

abstract = "The effect of electric current on Portevin-Le Chatelier (PLC) effect of CoCrFeMnNi high-entropy alloy (HEA) was investigated. Compared with previous studies, PLC effects were firstly observed at much lower temperatures than 275 °C. Theoretical analysis based on the experimental results indicates that the electromigration effect and the increased concentration of vacancies induced by electric current can significantly improve the mobility of solute atoms in CoCrFeMnNi HEA. Together with the increased dislocation density, the enhanced mobility of solute atoms can facilitate the repeated locking and unlocking process of mobile dislocations by the solutes during plastic deformation process. Consequently, this leads to the promoted PLC effect at lower temperatures, which is also supported by TEM analysis and the estimated higher activation energy of 285.4 kJ mol−1 between 275 °C and 325 °C.",

keywords = "Electric current, High-entropy alloy, Low temperatures, Portevin-Le Chatelier effect, Serration behavior",

author = "Yafei Wang and Liu Xia and Yitao Cao and Hongjie Zhang and Zhonghu Hao and Weichao Wu",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2020",

month = aug,

day = "19",

doi = "10.1016/j.msea.2020.139893",

language = "English",

volume = "793",

journal = "Materials Science and Engineering: A",

issn = "0921-5093",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Imposition of electric current to promote the Portevin-Le Chatelier effect of CoCrFeMnNi high-entropy alloy at low temperatures

AU - Wang, Yafei

AU - Xia, Liu

AU - Cao, Yitao

AU - Zhang, Hongjie

AU - Hao, Zhonghu

AU - Wu, Weichao

PY - 2020/8/19

Y1 - 2020/8/19

N2 - The effect of electric current on Portevin-Le Chatelier (PLC) effect of CoCrFeMnNi high-entropy alloy (HEA) was investigated. Compared with previous studies, PLC effects were firstly observed at much lower temperatures than 275 °C. Theoretical analysis based on the experimental results indicates that the electromigration effect and the increased concentration of vacancies induced by electric current can significantly improve the mobility of solute atoms in CoCrFeMnNi HEA. Together with the increased dislocation density, the enhanced mobility of solute atoms can facilitate the repeated locking and unlocking process of mobile dislocations by the solutes during plastic deformation process. Consequently, this leads to the promoted PLC effect at lower temperatures, which is also supported by TEM analysis and the estimated higher activation energy of 285.4 kJ mol−1 between 275 °C and 325 °C.

AB - The effect of electric current on Portevin-Le Chatelier (PLC) effect of CoCrFeMnNi high-entropy alloy (HEA) was investigated. Compared with previous studies, PLC effects were firstly observed at much lower temperatures than 275 °C. Theoretical analysis based on the experimental results indicates that the electromigration effect and the increased concentration of vacancies induced by electric current can significantly improve the mobility of solute atoms in CoCrFeMnNi HEA. Together with the increased dislocation density, the enhanced mobility of solute atoms can facilitate the repeated locking and unlocking process of mobile dislocations by the solutes during plastic deformation process. Consequently, this leads to the promoted PLC effect at lower temperatures, which is also supported by TEM analysis and the estimated higher activation energy of 285.4 kJ mol−1 between 275 °C and 325 °C.

KW - Electric current

KW - High-entropy alloy

KW - Low temperatures

KW - Portevin-Le Chatelier effect

KW - Serration behavior

UR - http://www.scopus.com/inward/record.url?scp=85087784594&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2020.139893

DO - 10.1016/j.msea.2020.139893

M3 - Article

AN - SCOPUS:85087784594

SN - 0921-5093

VL - 793

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

M1 - 139893

ER -

Imposition of electric current to promote the Portevin-Le Chatelier effect of CoCrFeMnNi high-entropy alloy at low temperatures

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Keywords

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