Development of fullerene-reinforced aluminum

1995 ◽  
Vol 10 (2) ◽  
pp. 366-371 ◽  
Author(s):  
E.V. Barrera ◽  
J. Sims ◽  
D.L. Callahan
Keyword(s):  
Powder Metallurgy ◽  
Metal Matrix ◽  
Al Alloys ◽  
Matrix Composites ◽  
Dispersion Strengthening ◽  
X Ray Diffraction ◽  
X Ray ◽  
Homogeneous Dispersion ◽  
Heat Treated ◽  
Limited Diffusion

Powder metallurgy and casting have been used to produce aluminum with 1.3, 4, and 8 vol. % fullerene additions. Fullerene extract was mixed with Al and heat-treated to obtain various levels of dispersion of the fullerenes. Intergranular dispersion of stable fullerenes was accomplished by both powder metallurgy and casting; however, x-ray diffraction indicated the formation of some Al4C3. Homogeneous dispersion did not occur because of limited diffusion in the solid state or limited solubility of fullerene in Al in the liquid state. Enhancements in hardness over that for Al were observed yet were not comparable to precipitation hardened Al alloys since a less homogeneous dispersion was achieved. Interest in Al having fullerene additions is for development of fullerene strengthened materials where fullerenes act as nanosize dispersoids for dispersion strengthening of metals or as a lightweight reinforcement in metal-matrix composites.

scholarly journals Chemical Stability of Ti3C2 MXene with Al in the Temperature Range 500–700 °C

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1979 ◽  
Author(s):  
Jing Zhang ◽  
Shibo Li ◽  
Shujun Hu ◽  
Yang Zhou
Keyword(s):  
Electron Microscopy ◽  
Chemical Stability ◽  
Metal Matrix ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Transmission Electron ◽  
Work First ◽  
Scanning Electron

Ti3C2Tx MXene, a new 2D nanosheet material, is expected to be an attractive reinforcement of metal matrix composites because its surfaces are terminated with Ti and/or functional groups of –OH, –O, and –F which improve its wettability with metals. Thus, new Ti3C2Tx/Al composites with strong interfaces and novel properties are desired. To prepare such composites, the chemical stability of Ti3C2Tx with Al at high temperatures should be investigated. This work first reports on the chemical stability of Ti3C2Tx MXene with Al in the temperature range 500–700 °C. Ti3C2Tx is thermally stable with Al at temperatures below 700 °C, but it reacts with Al to form Al3Ti and TiC at temperatures above 700 °C. The chemical stability and microstructure of the Ti3C2Tx/Al samples were investigated by differential scanning calorimeter, X-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy.

The Influence of Microwave Sintering on the Tribological Performance of Powder Metallurgy Based Aluminum Cenospheres Composites

2015 ◽  
Vol 830-831 ◽  
pp. 71-74 ◽  
Author(s):  
M.G. Ananda Kumar ◽  
S. Seetharamu ◽  
P. Sampath Kumaran ◽  
Jagannath Nayak
Keyword(s):  
Powder Metallurgy ◽  
Erosion Resistance ◽  
Wear Behavior ◽  
Microwave Sintering ◽  
Wear Loss ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Slide Wear Behavior ◽  
Hardness Values

The Metal Matrix Composites (MMCs) especially Aluminum based systems have unique advantages of having superior mechanical, chemical and electrical properties, in addition to light weight and high stiffness. In this work, composites comprising of Aluminum with varied concentrations of Cenospheres as reinforcement was produced by Powder Metallurgy (PM) route. The densification of the composites was effected both by conventional and Microwave (MW) sintering techniques. The microstructures of the sintered samples were observed through scanning electron microscope (SEM) and phases by x ray diffraction technique (XRD), followed by evaluation of tribological parameter namely slide wear behavior and solid particle erosion resistance. The densities and the Brinell hardness values for the samples were also evaluated. The results showed that microwave sintered samples exhibited higher hardness, lower erosion and slide wear loss.

scholarly journals Development of TiB and nanocrystalline Ti-reinforced novel hybrid Ti nanocomposite produced by powder metallurgy

2022 ◽  
Author(s):  
D. A. Angel ◽  
T. Mikó ◽  
F. Kristály ◽  
M. Benke ◽  
Z. Gácsi
Keyword(s):  
Electron Microscopy ◽  
Powder Metallurgy ◽  
Hybrid Composites ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Transformation Mechanism ◽  
Vacuum Sintering ◽  
X Ray ◽  
Titanium Monoboride ◽  
Scanning Electron

AbstractTitanium monoboride (TiB) whisker-reinforced titanium (Ti) matrix composites were produced by powder metallurgy, through vacuum sintering. TiB is formed by thermal decomposition of TiB2 precursor. In addition, a new hybrid composite was developed by admixing nanograined and nanocrystalline (more important) Ti to enhance the transformation mechanism of TiB2 to TiB phase. The morphology and particle size of the initial powders, mixtures and the microstructure of the composites have been studied by scanning electron microscopy (SEM). The phase analysis and transformation monitoring were performed by X-ray diffraction (XRD). The sintered composites were also subjected to compressive strength and hardness measurements. According to XRD results, through the addition of nanocrystalline Ti, a probable enhancement of the TiB2 → TiB transformation occurred producing more TiB whiskers in the hybrid composites. All samples of the hybrid composites exhibited improved yield strength (1365 MPa) and hardness (358 HV) compared to the non-hybrid ones 927 MPa and 254 HV, respectively. Graphical abstract

Experimental Investigation of Aluminium Hybrid Composites Reinforced with ZnS, TiO2 and BaTiO3 Produced Through Powder Metallurgy

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
S. Rajeshkannan ◽  
I. Manikandan ◽  
M. Vigneshkumar
Keyword(s):  
Powder Metallurgy ◽  
Hybrid Composites ◽  
Brinell Hardness ◽  
High Hardness ◽  
High Strength ◽  
Hardness Test ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Testing Instrument ◽  
X Ray

Semiconductors like ZnS, TiO2 and BaTiO3 were reinforced with Al-Al2O3 Metal Matrix Composites (MMCs) and were made through powder metallurgy in order to have high strength, high hardness and good thermal conductivity compared with conventional materials. Three MMC of test specimens were prepared with varying reinforcement ratio Al-Al2O3-ZnS(94-5-1), Al-Al2O3-TiO2(94-5-1), Al-Al2O3-BaTiO3(94-5-1) percentage by weight respectively. The hardness test has been made by using Brinell hardness testing instrument. Hardness test revealed that the addition of reinforcement TiO2, BaTiO3 increases the hardness value. However, the addition of ZnS to the Al-Al2O3 MMCs showed decrease in the hardness value. The crystal structure of the 3 composites were examined through X-Ray Diffraction (XRD) peaks.

Studying the Formation of Fe2SiO4 and Pearlite Phasesin Iron-Silica Sand Nanoparticle Composites

2013 ◽  
Vol 337-338 ◽  
pp. 39-47
Author(s):  
Tahir Ahmad ◽  
Othman Mamat ◽  
Rafiq Ahmad ◽  
Amir N. Malik
Keyword(s):  
Metal Matrix ◽  
Liquid Phase Sintering ◽  
Silica Sand ◽  
Matrix Composites ◽  
Powder Metallurgy Technique ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iron Based ◽  
Nanoparticle Composites ◽  
Scanning Electron

Metal matrix composites have grown rapidly with their usefulness in many applications for industries. The present research aims to study the formation of Fe2SiO4 and pearlite phases, the reaction product of iron-silica sand nanoparticles composites. In this study iron based silica sand nanoparticles composite with 5, 10, 15 and 20wt.% of silica sand nanoparticles were developed using powder metallurgy technique being sintered at 1100°C. It was observed during the X-Ray Diffraction (XRD) and XPS analysis that the reaction between iron and silica sand nanoparticles forms the Fe2SiO4 phase. Field Emission Scanning Electron Microscopy (FESEM) analysis at higher magnification also reveals the formation of pearlite phase. The presence of liquid phase sintering is also observed with frozen liquid spots at microstructure of iron-silica sand nanoparticles reaction.

Corrosion Behavior of SiCp/6061 Al Metal Matrix Composites

CORROSION ◽  
1991 ◽  
Vol 47 (10) ◽  
pp. 741-753 ◽  
Author(s):  
H. Sun ◽  
E. Y. Koo ◽  
H. G. Wheat
Keyword(s):  
Metal Matrix Composites ◽  
Corrosion Behavior ◽  
Metal Matrix ◽  
Electrochemical Techniques ◽  
Microscopic Analysis ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrochemical Tests ◽  
Analysis Techniques

Abstract The corrosion behavior of silicon carbide/aluminum (SiCp/Al) metal matrix composites was studied in chloride solution by means of electrochemical techniques, scanning electron microscopy (SEM), Auger electron spectroscopy (AES), energy dispersive spectroscopy (EDS), and X-ray diffraction. The materials under investigation were powder metallurgy (P/M) processed 6061 Al reinforced with increasing amounts of SiC particles (15 to 40 vol%). Electrochemical tests such as potentiodynamic polarization were done in 0.035, 0.35, and 3.5% NaCl solutions that were open to air, aerated, or deaerated to observe overall corrosion behavior. In addition, pit morphology was observed after anodic polarization to a number of potentials. It was seen that the corrosion potentials did not vary greatly or show definite trends in relation to the amounts of SiCp reinforcement. However, the degree of corrosion increased with increasing SiCp content and the presence or absence of oxygen as well as the concentration of the NaCl solution did affect corrosion potentials. Microscopic analysis techniques were used to study the corroded samples and the extensive pitting and exfoliation of the surfaces. X-ray diffraction was used to identify the compounds on the surface of the corroded samples as well as the flakes due to exfoliation.

scholarly journals Microstructure, Mechanical Properties, and Corrosion Behavior of Boron Carbide Reinforced Aluminum Alloy (Al-Fe-Si-Zn-Cu) Matrix Composites Produced via Powder Metallurgy Route

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4315
Author(s):  
M. Meignanamoorthy ◽  
Manickam Ravichandran ◽  
Vinayagam Mohanavel ◽  
Asif Afzal ◽  
T. Sathish ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Powder Metallurgy ◽  
Corrosion Behavior ◽  
Xrd Analysis ◽  
Matrix Composites ◽  
Energy Dispersive Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Time Period ◽  
Mechanical Properties And Corrosion

In this paper, Al-Fe-Si-Zn-Cu (AA8079) matrix composites with several weight percentages of B4C (0, 5, 10, and 15) were synthesized by powder metallurgy (PM). The essential amount of powders was milled to yield different compositions such as AA8079, AA8079-5 wt.%B4C, AA8079-10 wt.%B4C, and AA8079-15 wt.%B4C. The influence of powder metallurgy parameters on properties’ density, hardness, and compressive strength was examined. The green compacts were produced at three various pressures: 300 MPa, 400 MPa, and 500 MPa. The fabricated green compacts were sintered at 375 °C, 475 °C, and 575 °C for the time period of 1, 2 and 3 h, respectively. Furthermore, the sintered samples were subjected to X-ray diffraction (XRD) analysis, Energy Dispersive Analysis (EDAX), and Scanning Electron Microscope (SEM) examinations. The SEM examination confirmed the uniform dispersal of B4C reinforcement with AA8079 matrix. Corrosion behavior of the composites samples was explored. From the studies, it is witnessed that the rise in PM process parameters enhances the density, hardness, compressive strength, and corrosion resistance.

Influence of heat treatment on the properties of AlSi10Mg-based metal matrix composites reinforced with metallic glass flakes processed by gas pressure infiltration

2017 ◽  
Vol 51 (30) ◽  
pp. 4165-4175 ◽  
Author(s):  
Klaudia Lichtenberg ◽  
Eric Orsolani-Uhlig ◽  
Ralf Roessler ◽  
Kay André Weidenmann
Keyword(s):  
Heat Treatment ◽  
Metallic Glass ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Gas Pressure ◽  
Special Focus ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Pressure Infiltration ◽  
X Ray

The reinforcement of a soft matrix material with hard particles is an established strategy to develop materials with tailored properties. In this regard, using metallic glasses with high crystallization temperatures, e.g. in the system NiNbX (X = Sn, Ta), for composites produced by liquid metal infiltration is a novel approach. The current work deals with the characterization of such metallic glass particle-reinforced AlSi10Mg-based metal matrix composites manufactured by gas pressure infiltration. Processing–structure–property relations were investigated with a special focus on the influence of an additional heat treatment on the metal matrix composite’s properties. Metallographic methods were used to investigate infiltration quality, particle distribution within the composite and the composite’s microstructure. Moreover, X-ray diffraction measurements, elastic analysis using ultrasonic spectroscopy and compression tests were performed to analyze its properties. The X-ray diffraction results indicate that there is no crystallization of the glass during processing. Metallographic investigations show that the flakes are arranged in a layered structure within the composite. The embedding of metallic glass flakes leads to an increase in Young’s modulus and compressive strength in comparison to the unreinforced material. The composite’s strength can be further increased by a heat treatment.

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