Investigation of Mechanical Properties of Al/CNT Nanocomposites Produced by Powder Metallurgy
Demanding requirements in automotive and aerospace applications promote the growing need to obtain materials and advanced technology capable of combining low weight with high mechanical properties. Aluminum matrix nanocomposites could be great candidates to respond to such needs. In this sense, this...
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| Format: | Article |
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MDPI AG
2022-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/1/54 |
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| author | Íris Carneiro Sónia Simões |
| author_facet | Íris Carneiro Sónia Simões |
| author_sort | Íris Carneiro |
| collection | DOAJ |
| description | Demanding requirements in automotive and aerospace applications promote the growing need to obtain materials and advanced technology capable of combining low weight with high mechanical properties. Aluminum matrix nanocomposites could be great candidates to respond to such needs. In this sense, this investigation aims to study the mechanical properties of nanocomposites of aluminum matrices reinforced with carbon nanotubes (CNTs). The nanocomposites were produced by powder metallurgy with 1.00 vol.% of reinforcement and ultrasonication as the dispersion method. Tensile, Vickers microhardness and nanoindentation tests were carried out in different sections. Microstructural characterizations were conducted in scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) to understand and relate to the mechanical properties. An increase in the yield strength of 185% was observed for the nanocomposites, which can be attributed to the load transfer mechanism. However, the CNTs observed at the grain boundaries promote a decrease in the ductility of the nanocomposites. The mechanical behavior of the nanocomposites was further investigated by EBSD observation. The results revealed that the nanocomposites have a less extensive area of plastic deformation than the Al matrix, which is consistent with the tensile results. The presence of reinforcement affects the lattice rotation during the tensile test and the active slip systems, thus affecting their deformation behavior. |
| first_indexed | 2024-03-11T10:08:50Z |
| format | Article |
| id | doaj.art-604d3716b8044be6b1301e20d357a536 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T10:08:50Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-604d3716b8044be6b1301e20d357a5362023-11-16T14:50:05ZengMDPI AGApplied Sciences2076-34172022-12-011315410.3390/app13010054Investigation of Mechanical Properties of Al/CNT Nanocomposites Produced by Powder MetallurgyÍris Carneiro0Sónia Simões1Department of Metallurgical and Materials Engineering (DEMM), University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, PortugalDepartment of Metallurgical and Materials Engineering (DEMM), University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, PortugalDemanding requirements in automotive and aerospace applications promote the growing need to obtain materials and advanced technology capable of combining low weight with high mechanical properties. Aluminum matrix nanocomposites could be great candidates to respond to such needs. In this sense, this investigation aims to study the mechanical properties of nanocomposites of aluminum matrices reinforced with carbon nanotubes (CNTs). The nanocomposites were produced by powder metallurgy with 1.00 vol.% of reinforcement and ultrasonication as the dispersion method. Tensile, Vickers microhardness and nanoindentation tests were carried out in different sections. Microstructural characterizations were conducted in scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) to understand and relate to the mechanical properties. An increase in the yield strength of 185% was observed for the nanocomposites, which can be attributed to the load transfer mechanism. However, the CNTs observed at the grain boundaries promote a decrease in the ductility of the nanocomposites. The mechanical behavior of the nanocomposites was further investigated by EBSD observation. The results revealed that the nanocomposites have a less extensive area of plastic deformation than the Al matrix, which is consistent with the tensile results. The presence of reinforcement affects the lattice rotation during the tensile test and the active slip systems, thus affecting their deformation behavior.https://www.mdpi.com/2076-3417/13/1/54metal matrix nanocompositescarbon nanotubesaluminumtensile testhardnessmechanical properties |
| spellingShingle | Íris Carneiro Sónia Simões Investigation of Mechanical Properties of Al/CNT Nanocomposites Produced by Powder Metallurgy Applied Sciences metal matrix nanocomposites carbon nanotubes aluminum tensile test hardness mechanical properties |
| title | Investigation of Mechanical Properties of Al/CNT Nanocomposites Produced by Powder Metallurgy |
| title_full | Investigation of Mechanical Properties of Al/CNT Nanocomposites Produced by Powder Metallurgy |
| title_fullStr | Investigation of Mechanical Properties of Al/CNT Nanocomposites Produced by Powder Metallurgy |
| title_full_unstemmed | Investigation of Mechanical Properties of Al/CNT Nanocomposites Produced by Powder Metallurgy |
| title_short | Investigation of Mechanical Properties of Al/CNT Nanocomposites Produced by Powder Metallurgy |
| title_sort | investigation of mechanical properties of al cnt nanocomposites produced by powder metallurgy |
| topic | metal matrix nanocomposites carbon nanotubes aluminum tensile test hardness mechanical properties |
| url | https://www.mdpi.com/2076-3417/13/1/54 |
| work_keys_str_mv | AT iriscarneiro investigationofmechanicalpropertiesofalcntnanocompositesproducedbypowdermetallurgy AT soniasimoes investigationofmechanicalpropertiesofalcntnanocompositesproducedbypowdermetallurgy |