Nanoindentation investigation on the dislocation generation at incipient plasticity in a high carbon-added high-entropy alloy

High-content interstitial carbon addition has been proven to regulate the dislocation behavior in high-entropy alloys (HEAs) during deformation, thereby overcoming the strength-ductility trade-off, but its exact mechanism is still unclear. In this work, the dislocation generation at incipient plasti...

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Bibliographic Details
Published in:Journal of materials research and technology 2023-11, Vol.27, p.6548-6557
Main Authors: Hu, Conghui, Zhang, Jianlei, Zhang, Yunhu, Chen, Gang, Song, Changjiang, Zhai, Qijie
Format: Article
Language:English
Subjects:
Dislocation behavior
High-entropy alloy
Interstitial carbon
Nanoindentation
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Summary:High-content interstitial carbon addition has been proven to regulate the dislocation behavior in high-entropy alloys (HEAs) during deformation, thereby overcoming the strength-ductility trade-off, but its exact mechanism is still unclear. In this work, the dislocation generation at incipient plasticity in a high carbon-added Al10(FeNiCoMn)90 HEA was investigated by instrumented nanoindentation. It was found that interstitial carbon addition could increase the atomic cohesion, which induced a higher maximum shear stress and activation volume required to trigger the incipient plasticity related to dislocation nucleation. However, it decreased the activation energy for a critical dislocation loop during deformation, increasing the dislocation density and facilitating dislocations multiplication. Consequently, the plastic zone underneath the indenter expanded and pop-in events occurred in the carbon-added HEAs. These findings contribute to understanding how interstitial carbon regulates the dislocation behavior in HEAs.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2023.11.153