Study on the deformation mechanism of the Al0.1CrFeCoNi high entropy alloy at different deformation degrees under electric pulse treatment

In this study, electrical pulses were used as a treatment to investigate the role played by dislocations in the deformation mechanism of the Al0.1CrFeCoNi high-entropy alloy (HEA) at different stages of deformation. The results demonstrated that the HEA was completely deformed through dislocation sl...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2022-11, Vol.857, p.144060, Article 144060
Main Authors: Xia, Liu, Wang, Yafei, Pan, Aigang, Wu, Weichao
Format: Article
Language:English
Subjects:
Corrosion resistance
Corrosive wear
Deformation mechanisms
Dislocation
Dislocation density
Electric pulse compression
Galvanic corrosion
High entropy alloy
High entropy alloys
Mechanical property
Microstructure
Ohmic dissipation
Protective coatings
Resistance heating
Technical services
Wear resistance
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Summary:In this study, electrical pulses were used as a treatment to investigate the role played by dislocations in the deformation mechanism of the Al0.1CrFeCoNi high-entropy alloy (HEA) at different stages of deformation. The results demonstrated that the HEA was completely deformed through dislocation slip during compression, and no twins were evident. Under the action of Electric pulse treatment (EPT), the specimen expanded thermally owing to Joule heating. Additionally, the pulse current accelerated the movement of the dislocations and led to dislocation annihilation, softening the material without changing the grain shape. However, further application of EPT with the same parameters failed to produce significant changes in the dislocation density, a phenomenon that has rarely been reported before. Our results provide strong theoretical and technical support for the rapid annealing of metallic materials during processing and the use of HEA in electrical structural components, such as wear-resistant coatings or parts resistant to galvanic corrosion. •The HEA is deformed through dislocation slip and no twins formed in this study.•No obvious microstructural change and shows typical FCC structure after EPT.•The GND can be effectively reduced by EPT but acts only for the first application.•The EPT would provide strong support for the rapid annealing process of the HEA.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2022.144060