scholarly journals structural characterization and dielectric properties of the effect of carbon nanotubes and silicon on AA2024 Metal Matrix Composites

2021 ◽  
Author(s):  
Muniyappan Mani ◽  
Iyandurai Natesan
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Properties ◽  
Metal Matrix Composites ◽  
Structural Characterization ◽  
Metal Matrix ◽  
Research Work ◽  
Dissipation Factor ◽  
Matrix Composites ◽  
Hybrid Metal Matrix Composites ◽  
Aa 2024

Abstract This research work focuses on the formation of AA2024-carbon nanotubes-silicon hybrid metal matrix composites. Structure morphology, structural characterization, elemental identification and dielectric properties of AA 2024 in the presence of carbon nanotubes, silicon and its combinations at various proportions were evaluated using SEM, XRD, EDX and Hioki 3532-50 LCR Hi-Tester. A two-stage stir casting method was used for the fabrication of AA2024 hybrid metal matrix composites. It was observed that the size of the AA 2024 + 4% CNT + 2% Si composite was found to be 23.6 nm, this shows enhanced results than other composites prepared. Dielectric properties of composites were characterized as a function of composition and frequency. It was found that the dielectric constant, dielectric loss and dissipation factor decreases smoothly with an increase of reinforcements and also frequency.

scholarly journals Structural Characterization and Dielectric Properties of the Effect of Carbon Nanotubes and Silicon on AA2024 Metal Matrix Composites

2021 ◽  
Author(s):  
Muniyappan Mani ◽  
Iyandurai Natesan
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Properties ◽  
Metal Matrix Composites ◽  
Structural Characterization ◽  
Metal Matrix ◽  
Research Work ◽  
Dissipation Factor ◽  
Stir Casting ◽  
Matrix Composites ◽  
Aa 2024

Abstract This research work focus on the formation of AA2024-carbon nanotubes-silicon hybrid metal matrixcomposites. Structure morphology, structural characterization, elemental identification and dielectric properties of AA 2024 in the presence of carbon nanotubes, silicon andits combinations at various proportions was evaluated using SEM, XRD, EDX and Hioki 3532-50 LCR Hi-Tester. A two-stage stir casting method was used for the fabrication of AA2024 hybrid metal matrix composites. It was observed that the size of the AA 2024 + 4% CNT + 2% Si composite wasfound to be 23.6 nm, this shows enhanced results than other composites prepared. Dielectric properties of composites were characterized as a function of composition and frequency. It was found that the dielectric constant, dielectric loss and dissipation factor decreases smoothly with an increase of reinforcements and also frequency.

Effect of Reinforcements on Mechanical Properties of Nickel Alloy Hybrid Metal Matrix Composites Processed by Sand Mold Technique

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Kumaraswamy Jayappa ◽  
Vijaya Kumar ◽  
Gange Gowda Purushotham
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
Research Work ◽  
Weight Percent ◽  
Matrix Composites ◽  
Hybrid Metal Matrix Composites ◽  
Ni Alloy

Hybrid Metal Matrix Composites (HMMCs) have gained wide applications in aerospace, marine, and domestic areas because of its significant properties relative to external forces and enabling environment. In present research work, Ni-alloy selected as a matrix and Al2O3 of 40–80 μm and TiO2 of 1–5 μm were selected as reinforcements. The composites were prepared by keeping 9 wt. % of TiO2 as unvarying and Al2O3 is varied from 3 weight % to 12 weight % in steps of 3 weight %. Induction furnace is used for the casting of composites and mixing is done by using mechanical stirring at 160 rpm for a time period of 5 min. The prepared composites are then tested for their tensile and hardness as per the ASTM standards. The Scanning Electron Microscopy was used for microstructural study. From experimentation, it was observed that increment in the weight percentage of Al2O3 with constant TiO2 increases the mechanical properties of hybrid composites and proper stirring improves homogeneity in the composite material. The test results show that the addition of Al2O3 up to 9 weight percent increases in tensile strength compared to Ni alloy and tensile strength slowly decreases with the addition of Al2O3 and that the hardness values are directly proportional to the weight percent of the addition of Al2O3 / TiO2.

scholarly journals Effect of Gr Contents on Wear Properties of Al2024/MgO/Al2O3/Gr Hybrid Composites

2018 ◽  
Vol 167 ◽  
pp. 02010 ◽  
Author(s):  
İsmail Ovalı ◽  
Cemal Esen ◽  
Sevda Albayrak ◽  
Halil Karakoç
Keyword(s):  
Wear Resistance ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
Three Dimensional ◽  
Matrix Composites ◽  
Wear Properties ◽  
Wear Process ◽  
Hybrid Metal Matrix Composites ◽  
Aa 2024

In the present study, hybrid metal matrix composites, Al2024/10Al2O3, Al2024/10Al2O3/3MgO, Al2024/10Al2O3/6MgO, Al2024/10Al2O3/3MgO/1.5 Gr, Al2024/10Al2O3/3MgO/3Gr, and reinforcement samples (AA 2024) produced with powder metallurgy process. AA 2024 and reinforcement powders were determined mixture rations and separately mixed during 30 minutes in a three-dimensional Turbula mixer. The mixed compositions were pressed at 300 MPa and sintered at 550°C during 1 h. After that, three materials were extruded at the same temperature. Experimental results show that hybrid metal matrix composites (HMMCs) a better wear resistance than the reinforcement samples because of higher hardness. Gr behave as a lubricant during wear process. The wear resistance of HMMCs can be optimized with controlling of the reinforcement content and type.

scholarly journals Sensor-Assisted Assessment of the Tribological Behavior Patterns of AA7075 Hybrid MMC Reinforced with Multi-Wall Carbon Nanotubes and Pulverized Fuel Ash

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2583
Author(s):  
Senthil Kumaran Selvaraj ◽  
Kathiravan Srinivasan ◽  
Ramesh Kumar S ◽  
Yuh-Chung Hu
Keyword(s):  
Carbon Nanotubes ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Behavioral Patterns ◽  
Multi Wall Carbon Nanotubes ◽  
Hybrid Metal Matrix Composites ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash

In recent years, the deployment of sensors and other ancillary technologies has turned out to be vital in the investigation of tribological behavioral patterns of composites. The tribological behavioral patterns of AA7075 hybrid metal matrix composites (MMCs) reinforced with multi-wall carbon nanotubes (MWCNTs), and pulverized fuel ash (PFA) were investigated in this work. The stir casting technique was used to fabricate the composites. The mechanical properties such as tensile strength and hardness were determined for the fabricated material. Besides, microstructure analysis was performed for these AA7075 hybrid MMCs reinforced with MWCNTs and pulverized fuel ash. A pin-on-disc wear testing setup was used to evaluate the wear rate, in which the EN 31 steel disc was used as the counter-face. Taguchi’s design of the experiments was used to optimize the input parameters that impact the characteristics of the hybrid composites, and ANOVA (analysis of variance) was used to determine the contribution of input parameters on the wear behavior. Electrical discharge machining (EDM) was conducted on the AA7075 hybrid metal matrix composites using a copper electrode for determining the material removal rate. These investigations and the results were utilized for determining the optimized output process parameter values of the AA7075 metal matrix composite.

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