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Mechanisms of formation of Al4Cu9 during mechanical alloying: An experimental study.

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Title: Mechanisms of formation of Al4Cu9 during mechanical alloying: An experimental study.
Authors: Besson, R.1, Avettand-Fènoël, M.-N.1, Thuinet, L.1, Kwon, J.1, Addad, A.1, Roussel, P.2, Legris, A.1
Source: Acta Materialia. Apr2015, Vol. 87, p216-224. 9p.
Subjects: Mechanical alloying, Aluminum-copper alloys, Surface morphology, Milling (Metalwork), Chemical equilibrium, Nucleation
Abstract: In spite of its complex structure, the Cu-rich γ 1 -Al 4 Cu 9 compound is frequently observed in Al–Cu processing. In order to better understand the intriguing formation of this compound, a thorough experimental study of Al–25 at.% Cu mixtures produced by mechanical alloying (MA) was performed. Strong morphological changes are found to occur for moderate milling times. γ 1 -Al 4 Cu 9 is formed during the early milling steps (5.5 h), its volume fraction increasing continuously with milling time, while the equilibrium θ-Al 2 Cu expected for this composition is detected only for longer times (90 h). Whereas the early formation of γ 1 suggests that its nucleation should occur at Al/Cu interfaces, direct visualization reveals the presence of γ 1 crystallites within Cu-rich zones. The thermal instability of MA-formed γ 1 -Al 4 Cu 9 is evidenced, this phase evolving towards θ-Al 2 Cu at temperatures lower than those predicted for equilibrium conditions. These observations indicate that γ 1 -Al 4 Cu 9 may be able to form through non-thermally activated mechanisms. [ABSTRACT FROM AUTHOR]
Copyright of Acta Materialia 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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 101017799
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Mechanisms of formation of Al4Cu9 during mechanical alloying: An experimental study.
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  Data: <searchLink fieldCode="JN" term="%22Acta+Materialia%22">Acta Materialia</searchLink>. Apr2015, Vol. 87, p216-224. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Mechanical+alloying%22">Mechanical alloying</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum-copper+alloys%22">Aluminum-copper alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+morphology%22">Surface morphology</searchLink><br /><searchLink fieldCode="DE" term="%22Milling+%28Metalwork%29%22">Milling (Metalwork)</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+equilibrium%22">Chemical equilibrium</searchLink><br /><searchLink fieldCode="DE" term="%22Nucleation%22">Nucleation</searchLink>
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  Data: In spite of its complex structure, the Cu-rich γ 1 -Al 4 Cu 9 compound is frequently observed in Al–Cu processing. In order to better understand the intriguing formation of this compound, a thorough experimental study of Al–25 at.% Cu mixtures produced by mechanical alloying (MA) was performed. Strong morphological changes are found to occur for moderate milling times. γ 1 -Al 4 Cu 9 is formed during the early milling steps (5.5 h), its volume fraction increasing continuously with milling time, while the equilibrium θ-Al 2 Cu expected for this composition is detected only for longer times (90 h). Whereas the early formation of γ 1 suggests that its nucleation should occur at Al/Cu interfaces, direct visualization reveals the presence of γ 1 crystallites within Cu-rich zones. The thermal instability of MA-formed γ 1 -Al 4 Cu 9 is evidenced, this phase evolving towards θ-Al 2 Cu at temperatures lower than those predicted for equilibrium conditions. These observations indicate that γ 1 -Al 4 Cu 9 may be able to form through non-thermally activated mechanisms. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Acta Materialia 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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        Value: 10.1016/j.actamat.2014.12.050
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        Text: English
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        Type: general
      – SubjectFull: Aluminum-copper alloys
        Type: general
      – SubjectFull: Surface morphology
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      – SubjectFull: Milling (Metalwork)
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      – SubjectFull: Chemical equilibrium
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      – SubjectFull: Nucleation
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