Carbon nanotubes-reinforced aluminum alloy functionally graded materials fabricated by powder extrusion process

In this paper, the elastic properties of functionally graded materials reinforced by single-walled carbon nanotubes are studied. Three different matrices, including steel-silicon, iron-alumina and alumina-zirconia are considered. Besides, the effects of nanotube length, radius and volume fraction on the Young’s modulus of functionally graded matrices reinforced by single-walled carbon nanotubes are investigated. It is observed that short nanotubes not only cannot increase the longitudinal elastic modulus of the matrices, but sometimes decrease their elastic modulus. Of the three selected matrices, steel-silicon matrix would have the most enhancement. Investigation of the effect of nanotube volume fraction on the mechanical properties of nanocomposites shows that increasing the volume fraction of long single-walled carbon nanotube results in increasing the elastic modulus of the nanocomposites.

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Characterization of Aluminum Alloy–Silicon Carbide Functionally Graded Materials Developed by Centrifugal Casting Process

Applied Sciences ◽

10.3390/app11041625 ◽

2021 ◽

Vol 11 (4) ◽

pp. 1625

Author(s):

Ioan Milosan ◽

Tibor Bedő ◽

Camelia Gabor ◽

Daniel Munteanu ◽

Mihai Alin Pop ◽

...

Keyword(s):

Aluminum Alloy ◽

Functionally Graded Materials ◽

Centrifugal Casting ◽

Metallic Copper ◽

Casting Process ◽

Aluminum Carbide ◽

Functionally Graded ◽

Graded Materials ◽

Sic Particles ◽

Molten Aluminum Alloy

The continuous development of modern industries rises the necessity for functionally graded materials. This research starts from the consideration that the incorporation of SiC particles in the molten aluminum alloy can be difficult due to the very low wettability of SiC particles. In order to increase their wettability, SiC particles were covered with a layer of metallic copper. The incorporation of SiC particles into the aluminum alloy mass was performed by centrifugal casting. The secondary hypoeutectic Al-Si alloy used in this study was elaborated within the crucible of a resistors heated furnace. The metallic coating of SiC particles, in addition to the effect of increasing their wettability by molten metal, also has a role in preventing the formation of aluminum carbide in case of heating above 700 °C. A great amount of attention was paid to the parameters used during the centrifugal casting process. The results showed that adjusting the proportion of SiC particles within the composite allows us to obtain values of the thermal expansion coefficient within previously established limits. The present work demonstrates that the coating of SiC particles covered with a thin layer of metallic Cu creates the conditions to easily incorporate them into the molten Al mass, thus obtaining FGMs with controlled properties.

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Maneuverable postbuckling of extensible mechanical metamaterials using functionally graded materials and carbon nanotubes

Thin-Walled Structures ◽

10.1016/j.tws.2020.107264 ◽

2020 ◽

pp. 107264

Author(s):

Talal Salem ◽

Xiaoyun Xie ◽

Pengcheng Jiao ◽

Nizar Lajnef

Keyword(s):

Carbon Nanotubes ◽

Functionally Graded Materials ◽

Functionally Graded ◽

Graded Materials ◽

Mechanical Metamaterials

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Fracture toughness of epoxy-based stepped functionally graded materials reinforced with carbon nanotubes

Iranian Polymer Journal ◽

10.1007/s13726-017-0512-6 ◽

2017 ◽

Vol 26 (4) ◽

pp. 253-260 ◽

Cited By ~ 6

Author(s):

Sahar Moharrerzadeh Kurd ◽

Soran Hassanifard ◽

Stefan Hartmann

Keyword(s):

Carbon Nanotubes ◽

Fracture Toughness ◽

Functionally Graded Materials ◽

Functionally Graded ◽

Graded Materials

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Fabrication of Functionally Graded Materials Using Aluminum Alloys via Hot Extrusion

Metals ◽

10.3390/met9020210 ◽

2019 ◽

Vol 9 (2) ◽

pp. 210 ◽

Cited By ~ 2

Author(s):

Dasom Kim ◽

Kwangjae Park ◽

Minwoo Chang ◽

Sungwook Joo ◽

Sanghwui Hong ◽

...

Keyword(s):

Grain Size ◽

Aluminum Alloys ◽

Functionally Graded Materials ◽

Hot Extrusion ◽

Extrusion Process ◽

Functionally Graded ◽

Size Reduction ◽

Size Analysis ◽

Strengthening Effect ◽

Graded Materials

In this study, we have attempted to manufacture functionally graded materials (FGMs) using aluminum alloys 3003 and 6063 via a hot extrusion process to realize multifunctionality through achieving high strength and low weight. The FGMs were fabricated using Al3003 powder and Al6063 bulk to improve the interfacial properties. Particle size analysis and X-ray fluorescence of the Al3003 powder were used to analyze the composition of general Al3003; microstructure analysis revealed improved hardness with almost no defects, such as cracks at the interface between the two materials. The experimentally determined tensile strength of the composite was observed to be higher than the theoretical value calculated using the rule of mixtures; the strengthening mechanisms considered for the calculations were grain size reduction and precipitation hardening. In particular, we attempted to predict the strengthening effect resulting from the fine grain size of the powder and grain size reduction due to the extrusion process using the Hall–Petch equation. The Kelly–Tyson equation was also used to calculate the theoretical strength in the presence of the strengthening phases. Based on these results, it was confirmed that FGMs can be successfully produced using the hot extrusion process.

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