Abstract In this study we aim at examining the effect of in-situ and ex-situ interfacial ceramic layers at the Al-CNT interface on the thermal expansion coefficient of aluminum matrix composites at different temperatures. For this, two types of bulk composite materials were obtained by a combination of high-energy ball milling and hot pressing methods. These materials were based on the aluminum alloy reinforced with CNT with in-situ Al4C3 and ex-situ TiC interface ceramic layers. It was found that the ex-situ TiC layer on the CNT surface acts as a barrier layer suppressing the in-situ formation of Al4C3 at heating above 375°C during the solid phase synthesis of the composite. On average, the composites strengthened by CNT with ex-situ TiC layer can be 15% more effective in restraining the thermal expansion of aluminum matrix in the temperature range from 100 to 400°C compared to composites strengthened by CNT with in-situ Al4C3 layer. On the basis of Turner relation, a modified model is proposed for calculating the CTE of composites reinforced with CNT, taking into account the presence of interface ceramic layer. The obtained data indicate that the interface design strategy is promising for the engineering of aluminum matrix composites with improved CTE. Data availability The data that support the findings of this study are available from the corresponding author upon reasonable request.
Last. Mohamed Hassan(E-JUST: Egypt-Japan University of Science and Technology)H-Index: 27
view all 6 authors...
Aluminum matrix composites reinforced with reduced graphene oxide (rGO) and hybrid of carbon nanotube (CNT) and rGO are fabricated by solution coating powder metallurgy process. The hardness, wear resistance and coefficient of thermal expansion (CTE) of the reinforced aluminum composites and the associated microstructural changes with rGO range (0.2–0.6 wt%) and hybrids of 0.2 wt% CNT–rGO at different ratios have been investigated. The intensive microstructural observations show that rGO is adso...
Last. M. I. Alymov(RAS: Russian Academy of Sciences)H-Index: 4
view all 6 authors...
Abstract Using a metalorganic chemical vapor deposition (MOCVD) technique and a tungsten hexacarbonyl W(CO)6 as a precursor, a stable and continuous coating consisting of nonstoichiometric WC1-x nanoparticles with sizes from 10 to 30 nm on the surface of multi-walled carbon nanotubes (CNTs) was obtained. The resulting hybrid WC1-x/CNTs structures had a developed surface morphology, which contributed to a more complete realization of the potential of the physical and mechanical properties of CNTs...
#1N.Y. Li(Kunming University of Science and Technology)H-Index: 1
#2Chao Yang(Kunming University of Science and Technology)H-Index: 2
Last. J.H. Yi(Kunming University of Science and Technology)H-Index: 5
view all 8 authors...
Abstract High elongation aluminum matrix composites reinforced with carbon nanotubes (CNTs) were prepared by flake powder metallurgy, and densified by hot extrusion with a high extrusion ratio. After hot extrusion, fine and equiaxed grains were obtained in 2 wt% CNT/Al composite, and interfacial product (Al4C3) as well as bridge-connected CNTs aligned along the extrusion direction were found both in 1 wt% CNT/Al and 2 wt% CNT/Al composites. Both composites obtained high elongation while their st...
Novel one-dimensional template-grown coaxial SiC@carbon nanotubes (SiC@CNTs) were fabricated using a chemical vapor deposition method. To facilitate the formation of SiC on CNT template, a molecular-level mixing process was used to coat the surface of commercial multiwalled carbon nanotubes (MWCNTs) by Fe2O3. These Fe-CNTs were transformed into SiC@CNT nanotubes, which were then mixed with Al6061 alloy and consolidated by spark plasma sintering to obtain Al6061-SiC@CNT nanocomposites. The additi...
A micromechanical model is analytically developed to estimate the elastic modulus and the coefficient of thermal expansion (CTE) of the carbon nanotube (CNT)-reinforced metal matrix nanocomposites (MMNCs). The effects of two important microstructural features, including the CNT clusters and the waviness on the thermo-elastic response are investigated. The formation of aluminum carbide (Al4C3) layer due to the interaction between the CNT and the metal matrix is considered. A good agreement is fou...
Last. Min Song(CSU: Central South University)H-Index: 39
view all 8 authors...
Abstract Aluminum (Al) matrix composites gain tremendous attention as candidates for lightweight structural materials. Interfaces between the matrix and reinforcements, long-standing concerns, are critical in determining the mechanical properties of Al matrix composites. Unlike the conventional thoughts that focus on raising the interfacial wettability, a novel interfacial nano-decoration strategy is reported to enhance the interfacial adhesion by forming a diffusion interface between Al and car...
Abstract Existing aluminium metal matrix composites (Al MMCs) can attain both high tensile yield strength (>500 MPa) and high elastic modulus (>90 GPa) but usually at the expense of tensile strain-to-fracture (~5% or less). Here we report the development of a novel class of Al MMCs that can offer tensile yield strength of 515 ± 17 MPa, elastic modulus of 95.6 ± 1.7 GPa and tensile strain-to-fracture of 10.4 ± 0.8%. Our design hypothesis is to reinforce the Al matrix with ex situ introduced carbo...
The interaction of liquid and solid aluminum with the graphene and graphite surfaces is studied using the density functional theory and a molecular dynamics simulation. The Morse potential is parameterized using the results of ab initio calculations in order to describe the interaction between aluminum and carbon atoms. This potential is used to investigate the interaction of a molten aluminum drop with the (0001) graphite surface theoretically. The properties of the free aluminum melt surface a...
Abstract Carbon nanotubes (CNTs) are popular as the chosen reinforcement to achieve excellent mechanical and functional performance in aluminum matrix nanocomposites (AMNCs). However, the key bottleneck problems restrict the strengthening effect using CNTs in AMNCs due to the dispersion homogeneity of CNTs, the distinct differences in physical properties, poor wettability and interface bonding between CNTs and aluminum matrix. This study aims to address these key issues by introducing a continuo...
Abstract null null The effect of different sintering techniques (vacuum sintering, hot-pressing, spark plasma sintering) on microstructure and mechanical properties were investigated for pre-synthesized core-shell (Al/Cu) particles reinforced Al matrix composites (AMC). In the first step, copper was deposited on aluminum powder particles by galvanic replacement method to synthesize Al/Cu particulates. In the next step, green compacts of Al/Cu core-shell particles reinforced AMCs were prepared by...
