Mechanical Properties of AA2024 Aluminum/MWCNTs Nanocomposites Produced Using Different Powder Metallurgy Methods
Metal matrix composites are a class of materials with high potential for industrial application due to the multifaceted properties that they possess. In the present research, mechanical alloying via ball milling was used to produce AA2024 powder that was subsequently reinforced with multiwalled carb...
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MDPI AG
2022-08-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/8/1315 |
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| author | Fani Stergioudi Alexandros Prospathopoulos Alexandros Farazas Evangelos Ch. Tsirogiannis Nikolaos Michailidis |
| author_facet | Fani Stergioudi Alexandros Prospathopoulos Alexandros Farazas Evangelos Ch. Tsirogiannis Nikolaos Michailidis |
| author_sort | Fani Stergioudi |
| collection | DOAJ |
| description | Metal matrix composites are a class of materials with high potential for industrial application due to the multifaceted properties that they possess. In the present research, mechanical alloying via ball milling was used to produce AA2024 powder that was subsequently reinforced with multiwalled carbon nanotubes (MWCNTs). Dispersion of the MWCNTs in the AA2024 matrix was achieved also by ball milling. Two different powder metallurgy sequencies, (i) double pressing double sintering and (ii) hot pressing were used for compaction and consolidation of the AA2024 reinforced by MWCNTs. The produced nanocomposites outperform the pristine AA2024 in terms of compressive strength, elongation to failure, and microhardness. The strengthening mechanism was associated with the homogeneous distribution of MWCNTs in the AA2024 matrix and their efficient interfacial bonding, which was attested also by microstructural characterization. Hot pressing resulted in higher mechanical properties of the nanocomposite material. However, when reinforcement content was above 2 wt.% a dramatic decrease of mechanical properties was observed, attributed to clustering and inhomogeneous dispersion of the MWCNTs. The homogeneous dispersion of MWCNTs in the AA2024 matrix and the retaining of their structural integrity are pivotal in increasing the mechanical properties, which can be directly associated with the efficient interfacial load transfer between MWCNTs and AA2024 matrix. |
| first_indexed | 2024-03-09T09:52:31Z |
| format | Article |
| id | doaj.art-07b12fb353d2458387f1ee46aca03f13 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T09:52:31Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-07b12fb353d2458387f1ee46aca03f132023-12-01T23:59:38ZengMDPI AGMetals2075-47012022-08-01128131510.3390/met12081315Mechanical Properties of AA2024 Aluminum/MWCNTs Nanocomposites Produced Using Different Powder Metallurgy MethodsFani Stergioudi0Alexandros Prospathopoulos1Alexandros Farazas2Evangelos Ch. Tsirogiannis3Nikolaos Michailidis4Physical Metallurgy Laboratory (PML), Mechanical Engineering Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreecePhysical Metallurgy Laboratory (PML), Mechanical Engineering Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreecePhysical Metallurgy Laboratory (PML), Mechanical Engineering Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceEODH SA, 31 Giannitson Str., Balkan Center, Filippos Building, 54627 Thessaloniki, GreecePhysical Metallurgy Laboratory (PML), Mechanical Engineering Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceMetal matrix composites are a class of materials with high potential for industrial application due to the multifaceted properties that they possess. In the present research, mechanical alloying via ball milling was used to produce AA2024 powder that was subsequently reinforced with multiwalled carbon nanotubes (MWCNTs). Dispersion of the MWCNTs in the AA2024 matrix was achieved also by ball milling. Two different powder metallurgy sequencies, (i) double pressing double sintering and (ii) hot pressing were used for compaction and consolidation of the AA2024 reinforced by MWCNTs. The produced nanocomposites outperform the pristine AA2024 in terms of compressive strength, elongation to failure, and microhardness. The strengthening mechanism was associated with the homogeneous distribution of MWCNTs in the AA2024 matrix and their efficient interfacial bonding, which was attested also by microstructural characterization. Hot pressing resulted in higher mechanical properties of the nanocomposite material. However, when reinforcement content was above 2 wt.% a dramatic decrease of mechanical properties was observed, attributed to clustering and inhomogeneous dispersion of the MWCNTs. The homogeneous dispersion of MWCNTs in the AA2024 matrix and the retaining of their structural integrity are pivotal in increasing the mechanical properties, which can be directly associated with the efficient interfacial load transfer between MWCNTs and AA2024 matrix.https://www.mdpi.com/2075-4701/12/8/1315aluminum alloymultiwall carbon nanotubes (MWCNTs)mechanical propertiesmicrostructure |
| spellingShingle | Fani Stergioudi Alexandros Prospathopoulos Alexandros Farazas Evangelos Ch. Tsirogiannis Nikolaos Michailidis Mechanical Properties of AA2024 Aluminum/MWCNTs Nanocomposites Produced Using Different Powder Metallurgy Methods Metals aluminum alloy multiwall carbon nanotubes (MWCNTs) mechanical properties microstructure |
| title | Mechanical Properties of AA2024 Aluminum/MWCNTs Nanocomposites Produced Using Different Powder Metallurgy Methods |
| title_full | Mechanical Properties of AA2024 Aluminum/MWCNTs Nanocomposites Produced Using Different Powder Metallurgy Methods |
| title_fullStr | Mechanical Properties of AA2024 Aluminum/MWCNTs Nanocomposites Produced Using Different Powder Metallurgy Methods |
| title_full_unstemmed | Mechanical Properties of AA2024 Aluminum/MWCNTs Nanocomposites Produced Using Different Powder Metallurgy Methods |
| title_short | Mechanical Properties of AA2024 Aluminum/MWCNTs Nanocomposites Produced Using Different Powder Metallurgy Methods |
| title_sort | mechanical properties of aa2024 aluminum mwcnts nanocomposites produced using different powder metallurgy methods |
| topic | aluminum alloy multiwall carbon nanotubes (MWCNTs) mechanical properties microstructure |
| url | https://www.mdpi.com/2075-4701/12/8/1315 |
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