TEM characterization of Al–C–Cu–Al2O3 composites produced by mechanical milling

Santos-Beltrán, A.; Gallegos-Orozco, V.; Estrada-Guel, I.; Béjar, L.; Espinosa‐Magaña, F.; Miki‐Yoshida, M.; Martínez-Sánchez, R.

doi:10.1016/j.jallcom.2006.08.303

Cited by 13 publications

(7 citation statements)

References 11 publications

(11 reference statements)

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“…The chemical composition (wt.%) of the alloy was Zn-5.6, Mg-2.5, Cu-1.6, Cr-0.23, Al (balance) and graphite nanoparticles (GNP) 0-2. The GNP (20-30 nm) were produced from graphite powder and metallized by MA in a high energy SPEX mill as according to a method already reported [16,17].…”

Section: Methodsmentioning

confidence: 99%

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Graphite nanoparticle dispersion in 7075 aluminum alloy by means of mechanical alloying

Estrada-Guel

Carreño-Gallardo

Mendoza-Ruiz

et al. 2009

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 99%

“…Next, green samples were pressure-less sintered for 1 h at 523 K and 2 h at 773 K under a constant Ar flow. Sintered products were held for 0.5 h at 800 K and hot extruded by using an indirect extrusion method (extrusion ratio 16).…”

Section: Methodsmentioning

confidence: 99%

Graphite nanoparticle dispersion in 7075 aluminum alloy by means of mechanical alloying

Estrada-Guel

Carreño-Gallardo

Mendoza-Ruiz

et al. 2009

Journal of Alloys and Compounds

Self Cite

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“…The contrast observed in bright field images shown the general morphology of milled powders and also some regions that appeared in dark contrast, corresponded to microstructural defects such as shear bands, which have been reported to occur during mechanical alloying due to the high deformation rates experimented. 15,16) Shear bands contained a high dense network of dislocations and preceded the formation of substructure inside of crystals. Different stages of mechanical alloying process have been established by observing these defects and the latter decomposition into low angle boundaries causing the decrease of crystallite size.…”

Section: Transmission Electron Microscopymentioning

confidence: 99%

Synthesis of Graphite Reinforced Aluminum Nanocomposite by Mechanical Alloying

Martı́nez-Sánchez

2010

Mater. Trans.

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Aluminum nanocomposite was obtained through mechanical alloying process using elemental powders of aluminum, copper and magnesium of high purity with the aim to obtain the 2024 aluminum alloy composition. Elemental powders and reinforcement particles were milled in a simoloyer mill for different times from 1 to 5 h. X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) results indicated that even for milling time of 5 h some elemental copper remained in the microstructure and has not been incorporated completely in solid solution into the aluminum lattice. Furthermore, it was not observed formation of any second phase, however when the specimens were subjected to Differential Thermal Analysis (DTA), it was observed in the microstructure the presence of Al 2 Cu, Al 4 C 3 and some oxide of the type CuO and CuO 2 . It was also demonstrated that average crystallite size of milled powders was refined to nanometric level while microhardness values were arising continuously with the milling time and were a maximum in the 2 mass% graphite specimen.

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“…This include mechanical milling [77] and Mechanical milling followed by hot extrusion [78]. In both studies the alumina nanofibers was found in the as sintered product.…”

Section: Alumina In Polymer Substratementioning

confidence: 99%

Synthesis of Alumina Nanofibers and Composites

Noordin¹,

Liew²

2010

Nanofibers

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IntroductionAlumina, Al 2 O 3 , is a ceramic metal oxide of great importance as building material, refractory material, electrical and heat insulator, attributed to its high strength, corrosion resistance, chemical stability, low thermal conductivity, and good electrical insulation. One phase of alumina, the -phase is widely used as catalyst, catalyst support and adsorbent because its high porosity and surface area. It is conventionally prepared by heating the hydrated trihydroxides, gibbsite and bayerite, to temperature of > 1000 o C to obtain the -alumina, corundum, a material with great hardness and low surface area. The trihydroxides, gibbsite, bayerite, both are Al(OH) 3. nH 2 O and the monohydroxyl oxide, boehmite, AlO(OH)·αH 2 O, have the monoclinic crystal structure with similar lattice parameters (a=0.866 nm, b=0.506 nm, c=0.983 nm, =94°34′ in boehmite, a=0.868 nm, b=0.507 nm, c=0.972 nm, =94°34′ in gibbsite, and a=0.867 nm, b=0.506 nm, c=0.942 nm, =90°26′ in bayerite [1,2]. In the process of heat treatment, the trihydroxide undergoes a series of transformations. It loses the water of hydration, then dehydroxalate at < 300 o C to form the monohydroxyl oxide boehmite, AlO(OH), which on further heating to increasingly higher temperatures, changes to the transition aluminas, including the -, -, -, and -phases, which then transform finally to the -form. These transition aluminas are crystalline solids with high porosity and surface areas as well as acidic and basic properties, which make them suitable as adsorbents, catalyst, catalyst support and fabricated into filtration membranes as well as used as fillers or components in polymer/ inorganic composite materials with enhanced mechanical properties. The conventional alumina as obtained are usually powder of particulates. These could be fabricated into alumina fibers by various method, through melt growth techniques including the internal crystallization method and extrusion, electrospraying [3] and electrospinning [4][5][6][7][8] have been developed for producing Al 2 O 3 fibers. The high surface areas of transition aluminas are due to the presence of pores. These pores are irregular in sizes and size distributions, and are mainly micropores of diameter less than 2 nm. Since the synthesis of mesoporous materials was first reported in the late 1980s , a number of methods for the synthesis of mesoporous alumina have been reported [8,9]. More recently, interest in nano-materials and nanotechnology has spurred a fury of investigations

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TEM characterization of Al–C–Cu–Al2O3 composites produced by mechanical milling

Cited by 13 publications

References 11 publications

Graphite nanoparticle dispersion in 7075 aluminum alloy by means of mechanical alloying

Graphite nanoparticle dispersion in 7075 aluminum alloy by means of mechanical alloying

Synthesis of Graphite Reinforced Aluminum Nanocomposite by Mechanical Alloying

Synthesis of Alumina Nanofibers and Composites

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