Investigation of Amorphous SiO2 and Activated Carbon (AC) on Microstructural, Mechanical, and Tribological Properties of Hybrid (AA7075) Metal Matrix Composites.

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Title: Investigation of Amorphous SiO2 and Activated Carbon (AC) on Microstructural, Mechanical, and Tribological Properties of Hybrid (AA7075) Metal Matrix Composites.
Authors: Banoth, Swapna1 (AUTHOR) bswapna@student.nitw.ac.in, Valasingam, Suresh Babu1 (AUTHOR), Darla, Venkata Ramanaiah2 (AUTHOR), Gujjala, Raghavendra1 (AUTHOR), Prasad, Durga2 (AUTHOR)
Source: International Journal of Metalcasting. Jan2026, Vol. 20 Issue 1, p75-88. 14p.
Subjects: Silica, Activated carbon, Metallic composites, Mechanical wear, Mechanical behavior of materials, Microstructure, Aluminum alloys, Hybrid materials
Abstract: This study aims to synthesize AA7075/SiO2/AC hybrid aluminium composites using ultrasonic stir casting method with different amounts of reinforcement, SiO2 served as the primary reinforcement, while activated carbon (AC) acted as secondary reinforcement, added in weight percentages of SiO2 ranging from 0 to 8% and activated carbon of 2% being kept constant. Mechanical properties such as tensile strength, yield strength, and hardness were tested and evaluated. The findings revealed about 42.36% increase in hardness and 49.40% increase UTS (ultimate tensile strength) for AA7075/6% SiO2/2%AC hybrid composite compared to base matrix alloy. The microstructural analysis by optical microscopy (OM) and FESEM showed that the reinforcement particles were evenly spread in the matrix alloy without forming clusters. Interfacial reactions indicated the presence of Mg2Si precipitates and undissolved Al6(Fe, Mn) in aluminium solution. Adding stronger and stiffer reinforcements increased the composite hardness. Moreover, the presence of AA7075/6wt.% SiO2/2wt.%AC reinforcements greatly improved the tensile strength and wear resistance of the aluminium hybrid composite compared to base matrix. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Metalcasting is the property of Springer Nature 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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  Label: Title
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  Data: Investigation of Amorphous SiO<subscript>2</subscript> and Activated Carbon (AC) on Microstructural, Mechanical, and Tribological Properties of Hybrid (AA7075) Metal Matrix Composites.
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  Data: <searchLink fieldCode="AR" term="%22Banoth%2C+Swapna%22">Banoth, Swapna</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> bswapna@student.nitw.ac.in</i><br /><searchLink fieldCode="AR" term="%22Valasingam%2C+Suresh+Babu%22">Valasingam, Suresh Babu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Darla%2C+Venkata+Ramanaiah%22">Darla, Venkata Ramanaiah</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gujjala%2C+Raghavendra%22">Gujjala, Raghavendra</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Prasad%2C+Durga%22">Prasad, Durga</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Metalcasting%22">International Journal of Metalcasting</searchLink>. Jan2026, Vol. 20 Issue 1, p75-88. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Silica%22">Silica</searchLink><br /><searchLink fieldCode="DE" term="%22Activated+carbon%22">Activated carbon</searchLink><br /><searchLink fieldCode="DE" term="%22Metallic+composites%22">Metallic composites</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+wear%22">Mechanical wear</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum+alloys%22">Aluminum alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Hybrid+materials%22">Hybrid materials</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study aims to synthesize AA7075/SiO2/AC hybrid aluminium composites using ultrasonic stir casting method with different amounts of reinforcement, SiO2 served as the primary reinforcement, while activated carbon (AC) acted as secondary reinforcement, added in weight percentages of SiO2 ranging from 0 to 8% and activated carbon of 2% being kept constant. Mechanical properties such as tensile strength, yield strength, and hardness were tested and evaluated. The findings revealed about 42.36% increase in hardness and 49.40% increase UTS (ultimate tensile strength) for AA7075/6% SiO2/2%AC hybrid composite compared to base matrix alloy. The microstructural analysis by optical microscopy (OM) and FESEM showed that the reinforcement particles were evenly spread in the matrix alloy without forming clusters. Interfacial reactions indicated the presence of Mg2Si precipitates and undissolved Al6(Fe, Mn) in aluminium solution. Adding stronger and stiffer reinforcements increased the composite hardness. Moreover, the presence of AA7075/6wt.% SiO2/2wt.%AC reinforcements greatly improved the tensile strength and wear resistance of the aluminium hybrid composite compared to base matrix. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Metalcasting is the property of Springer Nature 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: 10.1007/s40962-025-01581-z
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 75
    Subjects:
      – SubjectFull: Silica
        Type: general
      – SubjectFull: Activated carbon
        Type: general
      – SubjectFull: Metallic composites
        Type: general
      – SubjectFull: Mechanical wear
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      – SubjectFull: Mechanical behavior of materials
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      – SubjectFull: Microstructure
        Type: general
      – SubjectFull: Aluminum alloys
        Type: general
      – SubjectFull: Hybrid materials
        Type: general
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      – TitleFull: Investigation of Amorphous SiO2 and Activated Carbon (AC) on Microstructural, Mechanical, and Tribological Properties of Hybrid (AA7075) Metal Matrix Composites.
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            NameFull: Banoth, Swapna
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            NameFull: Valasingam, Suresh Babu
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            NameFull: Darla, Venkata Ramanaiah
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            – D: 01
              M: 01
              Text: Jan2026
              Type: published
              Y: 2026
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