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Formation of an ordered phase in hcp precipitates during aging of bcc HfNbTaTiZr high-entropy alloy.

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Title: Formation of an ordered phase in hcp precipitates during aging of bcc HfNbTaTiZr high-entropy alloy.
Authors: Zhao, Yujun1 (AUTHOR) yujun.zhao@rub.de, Großwendt, Felix1 (AUTHOR), Rajkowski, Maik1 (AUTHOR), Gemagami, Parham1 (AUTHOR), Poulain, Régis2 (AUTHOR), Perrière, Loïc2 (AUTHOR), Couzinié, Jean-Philippe2 (AUTHOR), Weber, Sebastian1 (AUTHOR), Laplanche, Guillaume1 (AUTHOR), Li, Tong1 (AUTHOR) tong.li@rub.de
Source: Scripta Materialia. Jun2025, Vol. 262, pN.PAG-N.PAG. 1p.
Subjects: Atom-probe tomography, High-entropy alloys, Body centered cubic structure, Precipitation (Chemistry), Transmission electron microscopy
Abstract: The role of O in the precipitation behavior at high temperatures of the equiatomic body-centered cubic (bcc) HfNbTaTiZr high-entropy alloy remains unclear and hence is investigated in this work. We employed transmission electron microscopy and atom probe tomography to reveal structural and compositional evolutions of precipitation in HfNbTaTiZr upon isothermal aging at 1200 °C. Due to the presence of O in the atmosphere, a Zr-Hf-rich hexagonal closed-packed (hcp) phase precipitates from the bcc matrix after 200 h. Due to the gradual uptake of O by the alloy from 200 h to 500 h, the Ti and O concentrations of the hcp phase increase. This results in the formation of an ordered phase in the hcp phase with a structure similar to Ti 3 O, whose number density and size slightly increase with time. As the hcp phase is increasingly reinforced by oxygen solutes and oxide precipitates, it becomes harder. [Display omitted] [ABSTRACT FROM AUTHOR]
Copyright of Scripta Materialia is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 184174115
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Formation of an ordered phase in hcp precipitates during aging of bcc HfNbTaTiZr high-entropy alloy.
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  Data: <searchLink fieldCode="JN" term="%22Scripta+Materialia%22">Scripta Materialia</searchLink>. Jun2025, Vol. 262, pN.PAG-N.PAG. 1p.
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  Data: The role of O in the precipitation behavior at high temperatures of the equiatomic body-centered cubic (bcc) HfNbTaTiZr high-entropy alloy remains unclear and hence is investigated in this work. We employed transmission electron microscopy and atom probe tomography to reveal structural and compositional evolutions of precipitation in HfNbTaTiZr upon isothermal aging at 1200 °C. Due to the presence of O in the atmosphere, a Zr-Hf-rich hexagonal closed-packed (hcp) phase precipitates from the bcc matrix after 200 h. Due to the gradual uptake of O by the alloy from 200 h to 500 h, the Ti and O concentrations of the hcp phase increase. This results in the formation of an ordered phase in the hcp phase with a structure similar to Ti 3 O, whose number density and size slightly increase with time. As the hcp phase is increasingly reinforced by oxygen solutes and oxide precipitates, it becomes harder. [Display omitted] [ABSTRACT FROM AUTHOR]
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  Group: Ab
  Data: <i>Copyright of Scripta Materialia is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.scriptamat.2025.116634
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        Text: English
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      – SubjectFull: Atom-probe tomography
        Type: general
      – SubjectFull: High-entropy alloys
        Type: general
      – SubjectFull: Body centered cubic structure
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      – SubjectFull: Precipitation (Chemistry)
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      – SubjectFull: Transmission electron microscopy
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      – TitleFull: Formation of an ordered phase in hcp precipitates during aging of bcc HfNbTaTiZr high-entropy alloy.
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            – D: 01
              M: 06
              Text: Jun2025
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