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Improvement of Solidification Structure Uniformity in Al-Cu Alloy Casting Process.

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Title: Improvement of Solidification Structure Uniformity in Al-Cu Alloy Casting Process.
Authors: Li, Xueting1 lixueting2024@126.com
Source: Metalurgija. 2026, Vol. 65 Issue 3, p306-320. 15p.
Subjects: Solidification, Casting (Manufacturing process), Phase separation, Grain size, Squeeze casting, Aluminum-copper alloys, Mechanical behavior of materials
Abstract: Aluminum--copper alloys are core lightweight materials in aerospace applications; however, their casting is prone to grain size imbalance and Al2Cu phase segregation. To address these issues, this study focused on an Al-6.07 wt.% Cu alloy and employed a three-factor, three-level orthogonal experimental design using squeeze casting. The effects of pouring temperature, forming pressure, and holding time on solidification uniformity were investigated using metallographic microscopy, SEM, and EPMA. The results indicated that the optimal process parameters were a pouring temperature of 730 °C, a forming pressure of 170 MPa, and a holding time of 13 s, combined with aging at 120 °C for 4 h. Under these conditions, the grain size standard deviation (GSSD) of the surface and core was reduced to 7.3 μm and 13.5 μm, respectively, while the Al2Cu phase segregation degree decreased to 0.14. Consequently, the tensile strength reached 342 MPa, with a microhardness of 120 HV. The study confirms that the proposed "pressure--temperature--solute" coupling mechanism effectively suppresses segregation, providing both theoretical insight and process guidance for the mass production of high-load-bearing alloy components. [ABSTRACT FROM AUTHOR]
Copyright of Metalurgija is the property of Croatian Metallurgical Society 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: 194737773
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PubType: Academic Journal
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  Data: Improvement of Solidification Structure Uniformity in Al-Cu Alloy Casting Process.
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  Data: <searchLink fieldCode="JN" term="%22Metalurgija%22">Metalurgija</searchLink>. 2026, Vol. 65 Issue 3, p306-320. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Solidification%22">Solidification</searchLink><br /><searchLink fieldCode="DE" term="%22Casting+%28Manufacturing+process%29%22">Casting (Manufacturing process)</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+separation%22">Phase separation</searchLink><br /><searchLink fieldCode="DE" term="%22Grain+size%22">Grain size</searchLink><br /><searchLink fieldCode="DE" term="%22Squeeze+casting%22">Squeeze casting</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum-copper+alloys%22">Aluminum-copper alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Aluminum--copper alloys are core lightweight materials in aerospace applications; however, their casting is prone to grain size imbalance and Al2Cu phase segregation. To address these issues, this study focused on an Al-6.07 wt.% Cu alloy and employed a three-factor, three-level orthogonal experimental design using squeeze casting. The effects of pouring temperature, forming pressure, and holding time on solidification uniformity were investigated using metallographic microscopy, SEM, and EPMA. The results indicated that the optimal process parameters were a pouring temperature of 730 °C, a forming pressure of 170 MPa, and a holding time of 13 s, combined with aging at 120 °C for 4 h. Under these conditions, the grain size standard deviation (GSSD) of the surface and core was reduced to 7.3 μm and 13.5 μm, respectively, while the Al2Cu phase segregation degree decreased to 0.14. Consequently, the tensile strength reached 342 MPa, with a microhardness of 120 HV. The study confirms that the proposed "pressure--temperature--solute" coupling mechanism effectively suppresses segregation, providing both theoretical insight and process guidance for the mass production of high-load-bearing alloy components. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Metalurgija is the property of Croatian Metallurgical Society 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: 10.64486/m.65.3.10
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      – Code: eng
        Text: English
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        PageCount: 15
        StartPage: 306
    Subjects:
      – SubjectFull: Solidification
        Type: general
      – SubjectFull: Casting (Manufacturing process)
        Type: general
      – SubjectFull: Phase separation
        Type: general
      – SubjectFull: Grain size
        Type: general
      – SubjectFull: Squeeze casting
        Type: general
      – SubjectFull: Aluminum-copper alloys
        Type: general
      – SubjectFull: Mechanical behavior of materials
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      – TitleFull: Improvement of Solidification Structure Uniformity in Al-Cu Alloy Casting Process.
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            – D: 01
              M: 09
              Text: 2026
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              Y: 2026
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