High-rate superplasticity in an equiatomic medium-entropy VCoNi alloy enabled through dynamic recrystallization of a duplex microstructure of ordered phases
DC Field | Value | Language |
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dc.contributor.author | Sohn, Seok Su | - |
dc.contributor.author | Kim, Dong Geun | - |
dc.contributor.author | Jo, Yong Hee | - |
dc.contributor.author | da Silva, Alisson Kwiatkowski | - |
dc.contributor.author | Lu, Wenjun | - |
dc.contributor.author | Breen, Andrew John | - |
dc.contributor.author | Gault, Baptiste | - |
dc.contributor.author | Ponge, Dirk | - |
dc.date.accessioned | 2021-08-30T17:59:57Z | - |
dc.date.available | 2021-08-30T17:59:57Z | - |
dc.date.created | 2021-06-19 | - |
dc.date.issued | 2020-08-01 | - |
dc.identifier.issn | 1359-6454 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/53828 | - |
dc.description.abstract | Superplasticity proceeds from fine-grained structures and requires high intrinsic resistance to grain growth at the deformation temperature. Here, we show that a mixture of two kinds of brittle ordered phases enables superplastic behavior through dynamic recrystallization in an equiatomic medium-entropy VCoNi alloy as a model material. The alloy annealed at 900 degrees C exhibits a face-centered-cubic single phase. However, in-depth characterizatin at various length scales reveals that the alloy, when annealed at 800 degrees C, comprises two ordered phases: kappa(Co1.2Ni1.3V) and sigma (Co1.3NiV2.3). As a result of the conventional cold-rolling/annealing process and with the aid of an underlying eutectoid reaction, the alloy exhibits a duplex structure with an average grain size of less than 1 mu m, i.e. microduplex structure. The size, morphology, and crystallographic orientation do not substantially change during static isothermal holding at 800 degrees C, which implies a very high resistance to grain growth. With tensile deformation at 800 degrees C, however, both phases develop into an equiaxed microstructure with low dislocation density and a dramatic change occurs in the crystallographic texture of the K phase. These variations result from dynamic recrystallization (DRX), which leads to superplastic elongations of 330-450% at 700-800 degrees C and at strain rates ranging from 10 to 4 to 10(-2) s(-1). Notably, the superplastic behavior is favorable at the high strain rate due to the enhanced DRX activity, leading to the larger elongation with increasing strain rates. However, deformation-enhanced grain growth occurs concomitantly with dynamic recrystallization; these competitive processes are investigated to elucidate the mechanism of superplasticity in this model material. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | - |
dc.subject | ATOM-PROBE | - |
dc.subject | MECHANICAL-PROPERTIES | - |
dc.subject | TENSILE PROPERTIES | - |
dc.subject | AL ADDITION | - |
dc.subject | SIGMA-PHASE | - |
dc.subject | STABILITY | - |
dc.subject | BEHAVIOR | - |
dc.subject | RECONSTRUCTION | - |
dc.subject | TI-6AL-4V | - |
dc.subject | EVOLUTION | - |
dc.title | High-rate superplasticity in an equiatomic medium-entropy VCoNi alloy enabled through dynamic recrystallization of a duplex microstructure of ordered phases | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Sohn, Seok Su | - |
dc.identifier.doi | 10.1016/j.actamat.2020.03.048 | - |
dc.identifier.scopusid | 2-s2.0-85085478520 | - |
dc.identifier.wosid | 000542971400010 | - |
dc.identifier.bibliographicCitation | ACTA MATERIALIA, v.194, pp.106 - 117 | - |
dc.relation.isPartOf | ACTA MATERIALIA | - |
dc.citation.title | ACTA MATERIALIA | - |
dc.citation.volume | 194 | - |
dc.citation.startPage | 106 | - |
dc.citation.endPage | 117 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalResearchArea | Metallurgy & Metallurgical Engineering | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Metallurgy & Metallurgical Engineering | - |
dc.subject.keywordPlus | ATOM-PROBE | - |
dc.subject.keywordPlus | MECHANICAL-PROPERTIES | - |
dc.subject.keywordPlus | TENSILE PROPERTIES | - |
dc.subject.keywordPlus | AL ADDITION | - |
dc.subject.keywordPlus | SIGMA-PHASE | - |
dc.subject.keywordPlus | STABILITY | - |
dc.subject.keywordPlus | BEHAVIOR | - |
dc.subject.keywordPlus | RECONSTRUCTION | - |
dc.subject.keywordPlus | TI-6AL-4V | - |
dc.subject.keywordPlus | EVOLUTION | - |
dc.subject.keywordAuthor | Multi-principal element alloy | - |
dc.subject.keywordAuthor | Superplasticity | - |
dc.subject.keywordAuthor | Ordered phase | - |
dc.subject.keywordAuthor | Dynamic recrystallization | - |
dc.subject.keywordAuthor | Dynamic grain coarsening | - |
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