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Article: He-enhanced heterogeneity of radiation-induced segregation in FeNiCoCr high-entropy alloy

TitleHe-enhanced heterogeneity of radiation-induced segregation in FeNiCoCr high-entropy alloy
Authors
KeywordsAtom probe tomography
Electron energy-loss spectroscopy
He bubbles
High-entropy alloy
Radiation-induced segregation
Issue Date2022
Citation
Journal of Materials Science and Technology, 2022, v. 101, p. 226-233 How to Cite?
AbstractRadiation-induced segregation (RIS) is a typical non-equilibrium process that can dramatically alter the behavior of defect sinks and material properties under irradiation. However, RIS mechanisms have been rarely studied around small He bubbles owing to the technical challenges involved in direct measurements of local chemistry. Here, using state-of-the-art atom probe tomography, we report the RIS behavior near He bubbles in the FeNiCoCr high-entropy alloy that indicates Co segregates most strongly, followed by weaker Ni segregation, whereas Fe and Cr are depleted almost to the same degree. Exceptionally, the magnitude of Co segregation around He bubbles is higher than previously measured values at voids and dislocation loops. Electron energy-loss spectroscopy was used to measure the He density and pressure inside individual bubbles. We demonstrate that He bubbles are over-pressurized at the irradiation temperature that could result in the vacancy bias and the subsequent vacancy-dominated RIS mechanism. First-principles calculations further reveal that there are repulsive interactions between He and Co atoms that may reduce the frequency of Co-vacancy exchange. As a result, He atoms likely retard Co diffusion via the vacancy mechanism and enhance the heterogeneity of RIS in Co-containing multicomponent alloys. These insights could provide the basis for understanding He effects in nuclear materials and open an avenue for tailoring the local chemical order of medium-and high-entropy alloys.
Persistent Identifierhttp://hdl.handle.net/10722/326294
ISSN
2023 Impact Factor: 11.2
2023 SCImago Journal Rankings: 2.309
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLin, W. T.-
dc.contributor.authorYeli, G. M.-
dc.contributor.authorWang, G.-
dc.contributor.authorLin, J. H.-
dc.contributor.authorZhao, S. J.-
dc.contributor.authorChen, D.-
dc.contributor.authorLiu, S. F.-
dc.contributor.authorMeng, F. L.-
dc.contributor.authorLi, Y. R.-
dc.contributor.authorHe, F.-
dc.contributor.authorLu, Y.-
dc.contributor.authorKai, J. J.-
dc.date.accessioned2023-03-09T09:59:33Z-
dc.date.available2023-03-09T09:59:33Z-
dc.date.issued2022-
dc.identifier.citationJournal of Materials Science and Technology, 2022, v. 101, p. 226-233-
dc.identifier.issn1005-0302-
dc.identifier.urihttp://hdl.handle.net/10722/326294-
dc.description.abstractRadiation-induced segregation (RIS) is a typical non-equilibrium process that can dramatically alter the behavior of defect sinks and material properties under irradiation. However, RIS mechanisms have been rarely studied around small He bubbles owing to the technical challenges involved in direct measurements of local chemistry. Here, using state-of-the-art atom probe tomography, we report the RIS behavior near He bubbles in the FeNiCoCr high-entropy alloy that indicates Co segregates most strongly, followed by weaker Ni segregation, whereas Fe and Cr are depleted almost to the same degree. Exceptionally, the magnitude of Co segregation around He bubbles is higher than previously measured values at voids and dislocation loops. Electron energy-loss spectroscopy was used to measure the He density and pressure inside individual bubbles. We demonstrate that He bubbles are over-pressurized at the irradiation temperature that could result in the vacancy bias and the subsequent vacancy-dominated RIS mechanism. First-principles calculations further reveal that there are repulsive interactions between He and Co atoms that may reduce the frequency of Co-vacancy exchange. As a result, He atoms likely retard Co diffusion via the vacancy mechanism and enhance the heterogeneity of RIS in Co-containing multicomponent alloys. These insights could provide the basis for understanding He effects in nuclear materials and open an avenue for tailoring the local chemical order of medium-and high-entropy alloys.-
dc.languageeng-
dc.relation.ispartofJournal of Materials Science and Technology-
dc.subjectAtom probe tomography-
dc.subjectElectron energy-loss spectroscopy-
dc.subjectHe bubbles-
dc.subjectHigh-entropy alloy-
dc.subjectRadiation-induced segregation-
dc.titleHe-enhanced heterogeneity of radiation-induced segregation in FeNiCoCr high-entropy alloy-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jmst.2021.05.053-
dc.identifier.scopuseid_2-s2.0-85114706317-
dc.identifier.volume101-
dc.identifier.spage226-
dc.identifier.epage233-
dc.identifier.isiWOS:000766627700006-

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