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Modification mechanisms of hypereutectic Al-Fe alloys treated by Sm/Yb addition: Experiments and first-principles calculations.

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Title: Modification mechanisms of hypereutectic Al-Fe alloys treated by Sm/Yb addition: Experiments and first-principles calculations.
Authors: Mo, Liling1 (AUTHOR), Jiang, Minhao1 (AUTHOR), Zhou, Xiong1 (AUTHOR), Zhao, Yu-Jun1,2 (AUTHOR) zhaoyj@scut.edu.cn, Du, Jun1 (AUTHOR) tandujun@sina.com
Source: Journal of Alloys & Compounds. Jul2023, Vol. 948, pN.PAG-N.PAG. 1p.
Subjects: Hypereutectic alloys, Rare earth metals, Electron scattering, Thermal expansion, Thermal conductivity, Electric conductivity
Abstract: The effects of Sm/Yb on the microstructure, electrical conductivity (EC), thermal conductivity (TC) and thermal expansion properties of hypereutectic Al-Fe alloys were investigated by combining experiments and first-principles calculations. The microstructure evolution shows that the addition of Sm/Yb can effectively modify the primary Al 13 Fe 4 phase, observing the best modification effect with 0.5 % Sm and 0.3 % Yb addition. Besides, adding Sm/Yb can simultaneously improve the EC, TC and thermal expansion performance of hypereutectic Al-Fe alloys. The improvement of thermal-physical properties is mainly due to the fact that the coarse primary Al 13 Fe 4 intermetallic phase is modified to fine and star-like particles, which reduces the scattering of electrons and phonons. The first-principles calculation results show that both Sm/Yb can be stably adsorbed on the P1 terminal Al 13 Fe 4 (010) surface, then inhibits the preferential growth of primary Al 13 Fe 4 phase. The theoretical calculations and experimental results confirm that adsorption and constitutional undercooling are the main reasons for Sm/Yb modification. This study shows that rare earth elements modification is an effective method to control the morphology of primary phase and improve the thermal-physical properties of hypereutectic Al-Fe alloys. [Display omitted] • Sm and Yb can effectively modified the primary Al 13 Fe 4 in hypereutectic Al-Fe alloys. • Sm/Yb modification realized the synchronous improvement of microstructure and thermal-physical properties of Al-Fe alloys. • The enrichment of Sm and Yb on the star-like Al 13 Fe 4 surface in modified Al-7Fe alloys is observed. • Adsorption and constitutional undercooling are more likely to be main reasons for the Sm/Yb modification. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. 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.)
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DbLabel: Engineering Source
An: 162977371
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PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Modification mechanisms of hypereutectic Al-Fe alloys treated by Sm/Yb addition: Experiments and first-principles calculations.
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  Data: <searchLink fieldCode="AR" term="%22Mo%2C+Liling%22">Mo, Liling</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Minhao%22">Jiang, Minhao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhou%2C+Xiong%22">Zhou, Xiong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Yu-Jun%22">Zhao, Yu-Jun</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> zhaoyj@scut.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Du%2C+Jun%22">Du, Jun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> tandujun@sina.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Alloys+%26+Compounds%22">Journal of Alloys & Compounds</searchLink>. Jul2023, Vol. 948, pN.PAG-N.PAG. 1p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Hypereutectic+alloys%22">Hypereutectic alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Rare+earth+metals%22">Rare earth metals</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+scattering%22">Electron scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+expansion%22">Thermal expansion</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+conductivity%22">Electric conductivity</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The effects of Sm/Yb on the microstructure, electrical conductivity (EC), thermal conductivity (TC) and thermal expansion properties of hypereutectic Al-Fe alloys were investigated by combining experiments and first-principles calculations. The microstructure evolution shows that the addition of Sm/Yb can effectively modify the primary Al 13 Fe 4 phase, observing the best modification effect with 0.5 % Sm and 0.3 % Yb addition. Besides, adding Sm/Yb can simultaneously improve the EC, TC and thermal expansion performance of hypereutectic Al-Fe alloys. The improvement of thermal-physical properties is mainly due to the fact that the coarse primary Al 13 Fe 4 intermetallic phase is modified to fine and star-like particles, which reduces the scattering of electrons and phonons. The first-principles calculation results show that both Sm/Yb can be stably adsorbed on the P1 terminal Al 13 Fe 4 (010) surface, then inhibits the preferential growth of primary Al 13 Fe 4 phase. The theoretical calculations and experimental results confirm that adsorption and constitutional undercooling are the main reasons for Sm/Yb modification. This study shows that rare earth elements modification is an effective method to control the morphology of primary phase and improve the thermal-physical properties of hypereutectic Al-Fe alloys. [Display omitted] • Sm and Yb can effectively modified the primary Al 13 Fe 4 in hypereutectic Al-Fe alloys. • Sm/Yb modification realized the synchronous improvement of microstructure and thermal-physical properties of Al-Fe alloys. • The enrichment of Sm and Yb on the star-like Al 13 Fe 4 surface in modified Al-7Fe alloys is observed. • Adsorption and constitutional undercooling are more likely to be main reasons for the Sm/Yb modification. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. 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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jallcom.2023.169786
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Hypereutectic alloys
        Type: general
      – SubjectFull: Rare earth metals
        Type: general
      – SubjectFull: Electron scattering
        Type: general
      – SubjectFull: Thermal expansion
        Type: general
      – SubjectFull: Thermal conductivity
        Type: general
      – SubjectFull: Electric conductivity
        Type: general
    Titles:
      – TitleFull: Modification mechanisms of hypereutectic Al-Fe alloys treated by Sm/Yb addition: Experiments and first-principles calculations.
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Mo, Liling
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          Name:
            NameFull: Jiang, Minhao
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            NameFull: Zhou, Xiong
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            NameFull: Zhao, Yu-Jun
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            NameFull: Du, Jun
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            – D: 05
              M: 07
              Text: Jul2023
              Type: published
              Y: 2023
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              Value: 09258388
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            – Type: volume
              Value: 948
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            – TitleFull: Journal of Alloys & Compounds
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