Experimental Studies on CNT Reinforced Aluminum Matrix Nanocomposites

2015 ◽  
Vol 1101 ◽  
pp. 89-92
Author(s):  
K.V. Sreenivas Rao ◽  
S. Sanman
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Carbon Nanotube ◽  
Experimental Studies ◽  
Aluminum Matrix ◽  
Weight Fraction ◽  
Stir Casting ◽  
Aluminum Matrix Composites ◽  
Uniform Dispersion ◽  
The Matrix

The remarkable high tensile strength and very high aspect ratio of carbon nanotubes make them valuable components for mechanically reinforced composite materials. In this study, Carbon Nanotube (CNT) reinforced aluminum matrix composites were prepared by simple stir casting route with different percentages of Carbon Nanotube reinforcement. The prepared nanocomposite specimens were subjected to evaluation of mechanical properties and microstructure. It was evident from the study that, as the weight fraction of nanotube in the matrix increases, the ultimate tensile strength, macro and micro-hardness also increases. The microstructures show clustering of the carbon nanotubes in the matrix. The difficulties experienced in uniform dispersion of Carbon Nanotube in the matrix to achieve optimum desired properties are discussed.

scholarly journals Evolution of Microstructure and Mechanical Properties of LM25–HEA Composite Processed through Stir Casting with a Bottom Pouring System

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 230
Author(s):  
Mekala Chinababu ◽  
Nandivelegu Naga Krishna ◽  
Katakam Sivaprasad ◽  
Konda Gokuldoss Prashanth ◽  
Eluri Bhaskara Rao
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Matrix ◽  
Stir Casting ◽  
Significant Loss ◽  
Aluminum Matrix Composites ◽  
High Entropy Alloy ◽  
High Entropy ◽  
The Matrix

Aluminum matrix composites reinforced by CoCrFeMnNi high entropy alloy (HEA) particulates were fabricated using the stir casting process. The as-cast specimens were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The results indicated that flake-like silicon particles and HEA particles were distributed uniformly in the aluminum matrix. TEM micrographs revealed the presence of both the matrix and reinforcement phases, and no intermetallic phases were formed at the interface of the matrix and reinforcement phases. The mechanical properties of hardness and tensile strength increased with an increase in the HEA content. The Al 6063–5 wt.% HEA composite had a ultimate tensile strength (UTS) of approximately 197 MPa with a reasonable ductility (around 4.05%). The LM25–5 wt.% HEA composite had a UTS of approximately 195 Mpa. However, the percent elongation decreased to roughly 3.80%. When the reinforcement content increased to 10 wt.% in the LM25 composite, the UTS reached 210 MPpa, and the elongation was confined to roughly 3.40%. The fracture morphology changed from dimple structures to cleavage planes on the fracture surface with HEA weight percentage enhancement. The LM25 alloy reinforced with HEA particles showed enhanced mechanical strength without a significant loss of ductility; this composite may find application in marine and ship building industries.

Fabrication and Microstructure Study of Aluminum Matrix Composites Reinforced with SiC and B4C Particulates

2017 ◽  
Vol 16 ◽  
pp. 26-29 ◽  
Author(s):  
Gurpreet Singh Saini ◽  
Sanjeev Goyal
Keyword(s):  
Hybrid Composites ◽  
Aluminum Matrix ◽  
Base Material ◽  
Casting Process ◽  
Stir Casting ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
The Matrix ◽  
Sic Composites ◽  
Xrd Patterns

In the present paper aluminum matrix composites were fabricated using base material AA6082-T6. SiC and B4C particulates were used as reinforcement to obtain hybrid and non-hybrid composites through the conventional stir casting process. AA6082-T6/SiC composites with 5, 10, 15 and 20 wt % of SiC; AA6082-T6/B4C composites with 5, 10, 15 and 20 wt % of B4C and AA6082-T6/(SiC+B4C) hybrid composites with 5, 10, 15 and 20 wt % of (SiC+B4C) taking equal fraction of SiC and B4C were made and the microstructure study was carried out. X-Ray diffraction (XRD) patterns revels the presence of reinforcement within the matrix along with some other compounds. The microstructure of the fabricated composites was examined with the help of Scanning electron microscope (SEM) and the micrographs revealed that the dispersion of reinforced particles was reasonably uniform at all weight percentages.

scholarly journals Microstructure And Mechanical Properties Of Carbon Nanotube Reinforced Aluminum Matrix Composite

2021 ◽  
Author(s):  
Zhi Li
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Low Cycle Fatigue ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Calculation Model ◽  
Aluminum Matrix Composites ◽  
Compression Tests ◽  
Friction Stir

The carbon nanotube (CNT) was first discovered by Iijima in 1991. Carbon nanotubes have remarkable mechanical, electrical and thermal properties. Aluminum alloys are commonly used in various fields due to low density, good mechanical properties and excellent corrosion resistance. To enhance their strength, aluminum matrix composites reinforced by carbon nanotube have been recently developed. In the present work, the composite composed of 2 wt.% carbon nanotubes as the reinforcement and aluminum alloy 6061 as the matrix has been studied. It is fabricated by powder metallurgy and friction stir processing (FSP) followed by heat treatment. The main objectives of the research are to characterize the microstructure, mechanical properties as well as deformation behaviors. Optical microscopy, X-ray diffraction test, compression tests, tension tests, fractography and low cycle fatigue tests have been conducted. The prediction model for yield strength and the calculation model for Young’s modulus are analyzed and discussed.

scholarly journals TECHNICAL INVESTIGATION OF SEA SAND REINFORCEMENT FOR NOVEL AL6061- SEA SAND COMPOSITES: IDENTIFICATION OF PERFORMANCE AND MECHANICAL PROPERTIES

2020 ◽  
Vol 17 (36) ◽  
pp. 47-57
Author(s):  
Hammar Ilham AKBAR ◽  
Eko SUROJO ◽  
Dody ARIAWAN ◽  
Aditya Rio PRABOWO
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Matrix ◽  
Hardness Test ◽  
Sand Particle ◽  
Aluminum Matrix Composites ◽  
Oxide Compound ◽  
Sea Sand ◽  
The Matrix ◽  
Sand Particles

Lightweight materials with low-cost production have been developed in recent years. The addition of ceramics and oxide particles such as Al2O3, SiC, and SiO2 has been improving in the mechanical properties of aluminum matrix composites (AMCs). As a solution, the use of natural reinforcing material continues to investigate. This paper investigates sea sand as an alternative reinforcement to AMCs. The Al 6061 was used as the matrix and sea sand as reinforcement. The manufacturing of the composite was conducted by stir casting route with variation 0, 2, 4, 6 %wt of the reinforcement. The composite was tested in hardness and tensile strength, the hardness test was obtained according to ASTM E-10, and the tensile test was conducted according to JIS Z2201 standard. Composite density decreases linearly with the addition of the reinforcement from 2 %wt to 6%wt, and the same phenomenon is obtained in porosity, the porosity increases with the addition of sea sand particles from 2%wt to 6%wt. The decline in density due to the lower density of sea sand particles compared to the aluminum matrix. Higher the sea sand particle that disperses into the matrix resulted in a lower density of the composite. Increasing porosity caused a higher fraction of reinforcement resulting in wider surface contact between matrix and reinforcement that promote the porosity. The hardness and ultimate tensile strength of AMCs increase with increasing of sea sand particles content. The presence of an oxide compound on the sea sand increased the mechanical properties of the composite. Increasing in mechanical properties indicate the sea sand particle dispersed into the matrix and sea sand can be used as engineering purpose material.

scholarly journals ENHANCED MICROSTRUCTURE AND MECHANICAL PROPERTIES OF SiC PARTICLE REINFORCED ALUMINIUM ALLOY COMPOSITE MATERIALS

2019 ◽  
Vol 25 (4) ◽  
pp. 253 ◽  
Author(s):  
Manoj Kumar Pal ◽  
Arnav Vikram ◽  
Vineet Bajaj
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Tensile Strength ◽  
Aluminum Matrix ◽  
Hardness Test ◽  
Stir Casting ◽  
Homogeneous Distribution ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Sic Particles

<p class="AMSmaintext">Aluminium6061 alloy composites containing various volume fractions of Silicon Carbide (SiC) particles (0, 5%, 10%, 15%, 20% and 25%) were prepared by stir casting method. In the current study,<strong> </strong>microstructures and mechanical properties of cast silicon carbide (SiC) reinforced aluminum matrix composites (AMCs) were investigated. Optical microscopic examination, SEM, tensile strength test, hardness test and elongation test were carried out. The results showed that with the addition of SiC reinforcements in Aluminum6061 matrix increased hardness and tensile strength however, decreased elongation at 25% SiC reinforced AMC. Hardness and tensile strength were observed to be are maximum at 25% SiC and elongation is minimum at 25% SiC. Microstructural observation confirmed clustering and homogeneous distribution of SiC particles in the Al6061 matrix.</p>

High-speed cryogenic machining of the carbon nanotube reinforced nanocomposites: Finite element analysis and simulation

2017 ◽  
Vol 232 (11) ◽  
pp. 1927-1936 ◽  
Author(s):  
Pooyan Vahidi Pashaki ◽  
Milad Pouya ◽  
Vahid A Maleki
Keyword(s):  
Carbon Nanotubes ◽  
Finite Element ◽  
Carbon Nanotube ◽  
High Speed ◽  
Cutting Speed ◽  
Aluminum Matrix ◽  
Machining Process ◽  
Aluminum Matrix Composites ◽  
Mechanical And Thermal Properties ◽  
Cryogenic Machining

In this paper, a new approach for evaluating the cryogenic machining process of the carbon nanotube reinforced aluminum matrix composites is developed based on finite element method. Finite element modeling in commercial code ABAQUS/Explicit was used to simulate high-speed machining of carbon nanotube reinforced composites under dry and cryogenic conditions, where different parameters (carbon nanotubes loading and the cutting speed) were investigated. The matrix phases are given a Johnson–Cook failure criterion. For considering more realistic assumptions, mechanical and thermal properties of the materials are assumed as a function of temperature. Results shown that at the cutting velocity of 60 m/s, cryogenic cooling has caused decrease of workpiece plastic strain by 12% in comparison with the dry cooling. The model can be used to study the effect of weight fraction, orientation, and length of the carbon nanotubes on the manufacturing of the nanocomposites.

scholarly journals Mechanical Properties, Tribology and Electrochemical Studies of Al/Fly Ash/Eggshell Aluminium Matrix Composite

2021 ◽  
Vol 12 (4) ◽  
pp. 4900-4919
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Aluminum Matrix ◽  
Weight Fraction ◽  
Xrd Analysis ◽  
Stir Casting ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Cast Aluminum ◽  
Aluminium Matrix Composite

This work was carried out to investigate the effect of carbonized eggshells (CES) and fly ash on the microstructure, mechanical properties, wear, and corrosion characteristics of Al-Si12. The weight fraction (wt.%) of the CES particles was kept constant at 2.5 wt.%, while that of fly ash was varied at 2.5 wt.%, 5.0 wt.%, 7.5 wt.%, and 10.0 wt.%. The selected fabrication route was stir casting. The x-ray diffraction (XRD) analysis of the cast aluminum matrix composites (AMCs) revealed the presence of phases including α-aluminum, SiO2, and Si with the formation of the intermetallic CuAl2 phase. The microhardness of the cast samples increased with increasing weight fraction of the reinforcements up to the 7.5 wt.% fly ash sample. The tensile strength and compressive strength were highest for the 2.5 wt.%/CES 2.5 wt.%. Tribology studies showed that the lowest wear rate of 4.91 × 10-5 mm3/Nmm was obtained for the 2.5 wt.% fly ash sample, while the corrosion studies showed that the corrosion rate of 2.70 × 10-5 g/hr was lowest for the 2.5 wt.% fly ash as well.

scholarly journals The Investigation of Machinability and Surface Properties of Aluminium Alloy Matrix Composites

2021 ◽  
Vol 53 (4) ◽  
pp. 210412
Author(s):  
Priyadarsini Morampudi ◽  
Venkata Ramana V.S.N. ◽  
Koona Bhavani ◽  
Amrita M ◽  
V Srinivas
Keyword(s):  
Surface Roughness ◽  
Aluminum Matrix ◽  
Stir Casting ◽  
Aluminum Matrix Composites ◽  
Al Alloy ◽  
Matrix Composites ◽  
Casting Method ◽  
Alloy Matrix ◽  
The Matrix ◽  
Aluminium Alloy Matrix

Aluminum matrix composites (AMCs) are crucial to the progress of composite application areas due to their remarkable mechanical properties. Their usage has expanded into different fields such as the aerospace, automobile, and defense industries. The present study used wrought Al alloy AA6061 as the matrix, while ilmenite (FeTiO3) particles were used as reinforcement at different weight percentages to prepare metal matrix composites. One of the most economical and simple casting routes among the several available fabrication techniques for the preparation of composites is the stir casting method, which was applied in the present investigation to prepare the AMCs. The machinability of the fabricated composites and the surface roughness property after machining were studied to understand the effect of speed and feed during machining. The results showed that an increase in speed decreased the cutting forces and the surface roughness. Meanwhile, an increase in surface roughness was observed with an increase in feed.

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