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Strengthening and fracture mechanisms of a precipitation hardening high-entropy alloy fabricated by selective laser melting

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Title: Strengthening and fracture mechanisms of a precipitation hardening high-entropy alloy fabricated by selective laser melting
Authors: Yaowen Wu, Xinyi Zhao, Qiang Chen, Can Yang, Mingguang Jiang, Changyong Liu, Zhe Jia, Zhangwei Chen, Tao Yang, Zhiyuan Liu
Source: Virtual and Physical Prototyping, Vol 17, Iss 3, Pp 451-467 (2022)
Publisher Information: Taylor & Francis Group, 2022.
Publication Year: 2022
Collection: LCC:Science
LCC:Manufactures
Subject Terms: high entropy alloy, selective laser melting, strengthening mechanism, fracture mechanism, intercellular fracture, Science, Manufactures, TS1-2301
More Details: A precipitation hardening high-entropy alloy (HEA) (FeCoNi)86Al7Ti7 was fabricated by selective laser melting (SLM) and ageing treated under different temperatures and time conditions. Yield strength of the aged HEA increases substantially from 710 to 934 and then to 1203 MPa. Theoretical analyses reveal that the coherent L12 precipitate contributes most of the improved strength for the aged HEAs, whereas recovery during ageing causes the decrease of dislocation density thus exerts a softening effect. In addition, it is found that ductility decreases with increasing volume fraction of the incoherent L21 precipitates. Based on a void growth model, the trend is qualitatively explained. Moreover, a new fracture mode, intercellular fracture, is proposed to account for the strong dependence of fracture dimple size on the dislocation cells, also directly validated by delicate microstructural examination. The findings provide an effective strengthening method and propose a unique fracture mechanism for the additively manufactured HEA.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 1745-2759
1745-2767
17452759
Relation: https://doaj.org/toc/1745-2759; https://doaj.org/toc/1745-2767
DOI: 10.1080/17452759.2022.2037055
Access URL: https://doaj.org/article/ce4d3b3971134ac69f267cd6095f978c
Accession Number: edsdoj.4d3b3971134ac69f267cd6095f978c
Database: Directory of Open Access Journals
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  Data: Strengthening and fracture mechanisms of a precipitation hardening high-entropy alloy fabricated by selective laser melting
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  Data: <searchLink fieldCode="AR" term="%22Yaowen+Wu%22">Yaowen Wu</searchLink><br /><searchLink fieldCode="AR" term="%22Xinyi+Zhao%22">Xinyi Zhao</searchLink><br /><searchLink fieldCode="AR" term="%22Qiang+Chen%22">Qiang Chen</searchLink><br /><searchLink fieldCode="AR" term="%22Can+Yang%22">Can Yang</searchLink><br /><searchLink fieldCode="AR" term="%22Mingguang+Jiang%22">Mingguang Jiang</searchLink><br /><searchLink fieldCode="AR" term="%22Changyong+Liu%22">Changyong Liu</searchLink><br /><searchLink fieldCode="AR" term="%22Zhe+Jia%22">Zhe Jia</searchLink><br /><searchLink fieldCode="AR" term="%22Zhangwei+Chen%22">Zhangwei Chen</searchLink><br /><searchLink fieldCode="AR" term="%22Tao+Yang%22">Tao Yang</searchLink><br /><searchLink fieldCode="AR" term="%22Zhiyuan+Liu%22">Zhiyuan Liu</searchLink>
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  Data: Virtual and Physical Prototyping, Vol 17, Iss 3, Pp 451-467 (2022)
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  Data: Taylor & Francis Group, 2022.
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  Data: 2022
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– Name: Abstract
  Label: Description
  Group: Ab
  Data: A precipitation hardening high-entropy alloy (HEA) (FeCoNi)86Al7Ti7 was fabricated by selective laser melting (SLM) and ageing treated under different temperatures and time conditions. Yield strength of the aged HEA increases substantially from 710 to 934 and then to 1203 MPa. Theoretical analyses reveal that the coherent L12 precipitate contributes most of the improved strength for the aged HEAs, whereas recovery during ageing causes the decrease of dislocation density thus exerts a softening effect. In addition, it is found that ductility decreases with increasing volume fraction of the incoherent L21 precipitates. Based on a void growth model, the trend is qualitatively explained. Moreover, a new fracture mode, intercellular fracture, is proposed to account for the strong dependence of fracture dimple size on the dislocation cells, also directly validated by delicate microstructural examination. The findings provide an effective strengthening method and propose a unique fracture mechanism for the additively manufactured HEA.
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        Value: 10.1080/17452759.2022.2037055
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      – Text: English
    PhysicalDescription:
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        PageCount: 17
        StartPage: 451
    Subjects:
      – SubjectFull: high entropy alloy
        Type: general
      – SubjectFull: selective laser melting
        Type: general
      – SubjectFull: strengthening mechanism
        Type: general
      – SubjectFull: fracture mechanism
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      – SubjectFull: intercellular fracture
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      – SubjectFull: Science
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      – SubjectFull: TS1-2301
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              Y: 2022
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