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Study of Al composites prepared by high-energy ball milling; Effect of processing conditions

IVANOVICH ESTRADA GUEL ROBERTO MARTINEZ SANCHEZ (2014)

The present work deals with the synthesis of some Al-based composites prepared by mechanical milling and processing by powder metallurgy followed by the evaluation of process conditions as: type of additive, their concentration and milling intensity studying its effect on the characteristics of the powder composite and mechanical performance of the composite. Powder samples were microstructural characterized by electronic microscopy (SEM–TEM) and the mechanical response was followed by hardness and compressive tests. A pronounced effect on the mechanical response of the specimens was evident after the addition of reinforced particles and milling intensity. Microscopy studies showed a uniform dispersion of the reinforcing particles in the metallic matrix at nanometric scale and an important grain refinement of the Al matrix was confirmed. After processing, a 66% increase on the mechanical response was reached with 1% of additive complemented with short milling intensities.

Article

Aluminum; Composites; High-energy milling BIOLOGÍA Y QUÍMICA QUÍMICA

Effect of carbon nanoparticles addition on the mechanical properties of an aluminum composite prepared by mechanical milling and leaching process

IVANOVICH ESTRADA GUEL CALEB CARREÑO GALLARDO ROBERTO MARTINEZ SANCHEZ (2012)

Aluminum (Al) based composites were produced by a solid state route using a high energy ball milling. Pure Al and mechanochemical processed graphite (C) powders were used as precursors. The C particles were prepared under different milling intensities and an additional chemical leaching process. Microscopy studies showed a uniform dispersion of the carbon nanoparticles into the aluminum matrix. A pronounced effect on the mechanical response of the specimens (σmax, σy and hardness) was evident upon the addition of the C particles. An optimum value on the mechanical response was reached with small amounts of C complemented with medium milling intensities. This effect is believed to be caused by the homogeneous dispersion of the carbon particles into the matrix. Higher C contents cause both: particle agglomeration and saturation of the matrix, which decreases the mechanical properties of samples.

Article

Aluminum; Composites; Graphite; High energy milling BIOLOGÍA Y QUÍMICA QUÍMICA

AA2024–CNTs composites by milling process after T6-temper condition

ROBERTO MARTINEZ SANCHEZ RAUL PEREZ BUSTAMANTE IVANOVICH ESTRADA GUEL JOSE MARTIN HERRERA RAMIREZ MARIO MIKI YOSHIDA (2012)

The 2024 aluminum alloy produced from elemental powders and reinforced by the addition of carbon nanotubes were microstructural and mechanically characterized. Composites were synthesized through milling process followed by cold consolidation, sintering and hot extrusion. The effect of the nanotubes on the microstructure and mechanical properties were analyzed in the composites after T6 thermal treatment. Al4C3 formation was due to the reaction of carbon nanotubes and Al matrix. Precipitated Al–Cu phase coexists and presents interaction with crystallized carbide and dispersed nanotubes. There is a direct relationship of carbon nanotubes content and hardness answer.

Article

Composites; Aluminum; CNTs; Milling process; XRD; TEM BIOLOGÍA Y QUÍMICA QUÍMICA

Based-Carbon Reinforcements for Aluminum Composites

RAUL PEREZ BUSTAMANTE DENISSE ACOSTA PEÑALOZA MARIO MIKI YOSHIDA JOSE MARTIN HERRERA RAMIREZ (2013)

Based.carbon reinforcements (BCR) are interesting materials capable to be applied in several fields in materials science. Because of their excellent chemical, physical and mechanical properties, they are widely applied in electronic, automotive and aircraft industry.

Conference proceedings

Aluminum Composites BIOLOGÍA Y QUÍMICA QUÍMICA QUÍMICA FÍSICA OTRAS

Wear behavior in Al2024–CNTs composites synthesized by mechanical alloying

JOSE LUIS BUENO ESCOBEDO IVANOVICH ESTRADA GUEL MARIO MIKI YOSHIDA LILIANA LICEA JIMENEZ ROBERTO MARTINEZ SANCHEZ (2012)

The wear behavior of the 2024 aluminum alloy and its composites was evaluated through a pin-on-disk system. For this purpose the aluminum alloy was reinforced by carbon nanotubes dispersion produced by milling process. The nanotubes dispersion was carried out using a high energy mill for a fixed milling time. Milled powders were cold consolidated, sintered and then microstructurally and mechanically evaluated. The wear behavior of the alloy and its composites was evaluated considering the different nanotube contents under several abrasive conditions. The composites with higher nanotube concentration (5.0 wt%) displayed an improved wear resistance in all cases evaluated in this work.

Article

Carbon nanotubes; Aluminum; Composites; Milling process; Abrasive wear; Pin-on-disc BIOLOGÍA Y QUÍMICA QUÍMICA

Microstructural characterization in Al-C-Al2O3 Composites Produced by Mechanical Milling.

AUDEL SANTOS BELTRAN VERONICA GALLEGOS OROZCO IVANOVICH ESTRADA GUEL MARIO MIKI YOSHIDA (2005)

Aluminum-graphite-copper (Al-C-Cu) novel micro-composites have been produced using the Mechanical Alloying process (MA). The mechanical properties of the obtained composites have been evaluated. Yield strength (σy) values reached in the composites are considerably higher than those reported for pure aluminum. There is a direct relationship between σy and final graphite content in the composite. σy values increase as the nominal C content increases as well. We found that the most important hardening element was the graphite. We found that the optimal ratio Cu/C correspond to 0.33% for different volume fractions of graphite and cooper. There is an apparent synergy effect in σy between Cu and C. Results of TEM analysis have shown the presence of alumina particles in fiber shape from oxide surface of powder. Presence of alumina fibers in the composite improves the mechanical properties.

Article

ALUMINUM-BASED COMPOSITES BIOLOGÍA Y QUÍMICA QUÍMICA OTRAS ESPECIALIDADES QUÍMICAS OTRAS OTRAS

Effect of ball to powder ratio on the mechanosynthesis of Re2C and its compressibility

ALFREDO MARTINEZ GARCIA ANA KARIN NAVARRO MARTINEZ Christopher Neun Lkhamsuren Bayarjargal Wolfgang Morgenroth ERICK LOPEZ VAZQUEZ MIGUEL AVALOS BORJA Bjoern Winkler Erick Adrián Juárez Arellano (2019)

"The mechanosynthesis of hexagonal rhenium carbide (Re2C) from the elements is explored as a function of the balls to powder ratio (BPR). Burgios's equation has been used to calculate the accumulated energy (Delta E-accum) and the transferred energy per hit (Delta E-b). To get the complete mechanosynthesis of Re2C several conditions have to be met: BPR > 115: 1, Delta E-accum > 500 kJ/g, and Delta E-b > 2.656 x 10(-14) kJ. The reaction is completed after 30 min of milling if a BPR of 230: 1 is used. The pressure dependence of the unit-cell volume and the lattice parameters have been evaluated by synchrotron radiation diffraction using a diamond anvil cell up to 61(2) GPa. A fit of a 2nd-order Birch-Murnaghan equation of state results in a bulk modulus of B-0 = 374(3) GPa."

Article

Rhenium carbide High-energy ball-milling Compressibility Metastable phase Accumulated energy BIOLOGÍA Y QUÍMICA QUÍMICA QUÍMICA

Effect of milling time and CNT concentration on hardness of CNT/Al2024 composites produced by mechanical alloying

ROBERTO MARTINEZ SANCHEZ MARIO MIKI YOSHIDA LILIANA LICEA JIMENEZ IVANOVICH ESTRADA GUEL (2013)

Carbon nanotube/2024 aluminum alloy (CNT/Al2024) composites were fabricated with a combination of mechanical alloying (MA) and powder metallurgy routes. Composites were microstructurally and mechanically evaluated at sintering condition. A homogeneous dispersion of CNTs in the Al matrix was observed by a field emission scanning electron microscopy. High-resolution transmission electron microscopy confirmed not only the presence of well dispersed CNTs but also needle-like shape aluminum carbide (Al4C3) crystals in the Al matrix. The formation of Al4C3 was suggested as the interaction between the outer shells of CNTs and the Al matrix during MA process in which crystallization took place after the sintering process. The mechanical behavior of composites was evaluated by Vickers microhardness measurements indicating a significant improvement in hardness as function of the CNT content. This improvement was associated to a homogeneous dispersion of CNTs and the presence of Al4C3 in the aluminum alloy matrix.

Article

Aluminum; CNT; Mechanical alloying; Composites; Sintering BIOLOGÍA Y QUÍMICA QUÍMICA

Effect of Nd:YAG Laser Welding Process Parameters on Al4C3 Formation in Advanced Aluminum Graphite Composites

EDGAR DANIEL AGUILAR CORTES FELIPE DE JESUS GARCIA VAZQUEZ JORGE LEOBARDO ACEVEDO DAVILA FRANCISCO CEPEDA RODRIGUEZ MARTIN IGNACIO PECH CANUL (2012)

Aluminum/Graphite composites (Al/C composites) have the advantages of Al (light weight, easy

machinability and good heat conduction) in combination with the advantages of C whiskers (High

Young’s Modulus, small to negative CTE, high tensile strength and high thermal conductivity).

However, Metallographic analysis, EDX and microhardness profile revealed that fibers react with

molten aluminum to form the detrimental Al4C3 phase in the HAZ and fusion zone. In order to gain

information about temperature transformation and formation conditions, scanning electron microscopy,

and termochemistry analysis were used. For experiments, were used power density (I), pulse width (t),

frequency (F), travel speed (S) and filler material (M) as independent variables. Thereby, was found

that the main process variables that influence the formation of Al4C3 are pulse duration and welding

speed, and that the effect of these variables cannot be explained only by using a thermodynamic model,

requiring a subsequent kinetic analysis.

Book part

Laser welding; Aluminum/Graphite composites; Al4C3 INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA INDUSTRIAL

Dispersion of Graphite Nanoparticles in a 6063 aluminum alloy by mechanical milling and hot extrusion

Diana Crisel Mendoza Ruiz MIGUEL ANGEL ESNEIDER ALCALA Ivanovich Estrada Guel MARIO MIKI YOSHIDA MAGALY LOPEZ GOMEZ ROBERTO MARTINEZ SANCHEZ (2008)

Composites of Al-6063 aluminum alloy powder reinforced with graphite particles were

prepared by mechanical milling, sintering and subsequent hot extrusion. Mechanical properties

and microstructural characterization were done as a function of graphite content. For lower graphite

contents mechanical resistance is increasing as the graphite content is increased as well; for

higher contents, graphite agglomeration reduces mechanical resistance. This variation is related

to the graphite dispersion / agglomeration into aluminum alloy matrix.

Article

Dispersion, Graohite Nanoparticles, 6063 Aluminum Alloy, Mechanical Milling, Hot Extrusion INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE MATERIALES PROPIEDADES DE LOS MATERIALES PROPIEDADES DE LOS MATERIALES