Veronica Gallegos Orozco - Profile on Academia.edu (original) (raw)

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Papers by Veronica Gallegos Orozco

Research paper thumbnail of Changes in Fe L23 White Lines Intensities in Ti Doped Hematite Thin Fims

Microscopy and Microanalysis, 2004

Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia,... more Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.

Research paper thumbnail of Effect on Microstructure and Hardness of Reinforcement in Al–Cu with Al4C3 Nanocomposites

Metals

By superposition, the individual strengthening mechanisms via hardness analyses and the particle ... more By superposition, the individual strengthening mechanisms via hardness analyses and the particle dispersion contribution to strengthening were estimated for Al–C and Al–C–Cu composites and pure Al. An evident contribution to hardening due to the density of dislocations was observed for all samples; the presence of relatively high-density values was the result of the difference in the coefficients of thermal expansion (CTE) between the matrix and the reinforced particles when the composites were subjected to the sintering process. However, for the Al–C–Cu composites, the dispersion of the particles had an important effect on the strengthening. For the Al–C–Cu composites, the maximum increase in microhardness was ~210% compared to the pure Al sample processed under the same conditions. The crystallite size and dislocation density contribution to strengthening were calculated using the Langford–Cohen and Taylor equations from the microstructural analysis, respectively. The estimated mi...

Research paper thumbnail of Effect on Microstructure and Hardness of A2024 Aluminum Alloy Doped Cerium Oxide Nanoparticle

Microscopy and Microanalysis, 2015

Research paper thumbnail of Cooling Rate Influence on Corrosion Resistance of a A383 Aluminum Alloy in Contact with E10, E30 and E100 Bio-Ethanol

Research paper thumbnail of Microstructural Characterization in Al-C-Al 2 O 3 Composites Produced by Mechanical Milling

Journal of Metastable and Nanocrystalline Materials, 2005

Aluminum-graphite-copper (Al-C-Cu) novel micro-composites have been produced using the Mechanical... more 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.

Research paper thumbnail of White Lines and Electron Occupancy for Ti 3d States in BaTiO3 by EELS

White Lines and Electron Occupancy for Ti 3d States in BaTiO3 by EELS

Microscopy and Microanalysis, 2007

Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Fl... more Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007

Research paper thumbnail of Characterization of Al-Based Composites Produced by Mechanical Milling Using Electron Energy Loss Spectroscopy

Characterization of Al-Based Composites Produced by Mechanical Milling Using Electron Energy Loss Spectroscopy

Journal of Metastable and Nanocrystalline Materials, 2005

Research paper thumbnail of EELS Characterization in AL-C-Al2O3 Composites Produced by MA

Microscopy and Microanalysis, 2004

A number of research works have been carried out in recent years to develop engineering materials... more A number of research works have been carried out in recent years to develop engineering materials that are stronger and more resistant that the available commercial materials. Metal matrix composites (MMCs) are regarded as excellent materials to obtain properties that ...

Research paper thumbnail of Electronic Structure of YFe2 by EELS and Ab Initio Calculations

Advanced Materials …, 2009

Centro de Investigación en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120, CP 31109, C... more Centro de Investigación en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120, CP 31109, Chihuahua, Chihuahua, México a emilio.yanez@cimav.edu.mx, b veronica.gallegos@cimav.edu.mx, c jose.matutes@cimav.edu.mx, d ...

Research paper thumbnail of Changes in Fe L23 White Lines Intensities in Ti Doped Hematite Thin Fims

Microscopy and Microanalysis, 2004

Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia,... more Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.

Research paper thumbnail of Effect on Microstructure and Hardness of Reinforcement in Al–Cu with Al4C3 Nanocomposites

Metals

By superposition, the individual strengthening mechanisms via hardness analyses and the particle ... more By superposition, the individual strengthening mechanisms via hardness analyses and the particle dispersion contribution to strengthening were estimated for Al–C and Al–C–Cu composites and pure Al. An evident contribution to hardening due to the density of dislocations was observed for all samples; the presence of relatively high-density values was the result of the difference in the coefficients of thermal expansion (CTE) between the matrix and the reinforced particles when the composites were subjected to the sintering process. However, for the Al–C–Cu composites, the dispersion of the particles had an important effect on the strengthening. For the Al–C–Cu composites, the maximum increase in microhardness was ~210% compared to the pure Al sample processed under the same conditions. The crystallite size and dislocation density contribution to strengthening were calculated using the Langford–Cohen and Taylor equations from the microstructural analysis, respectively. The estimated mi...

Research paper thumbnail of Effect on Microstructure and Hardness of A2024 Aluminum Alloy Doped Cerium Oxide Nanoparticle

Microscopy and Microanalysis, 2015

Research paper thumbnail of Cooling Rate Influence on Corrosion Resistance of a A383 Aluminum Alloy in Contact with E10, E30 and E100 Bio-Ethanol

Research paper thumbnail of Microstructural Characterization in Al-C-Al 2 O 3 Composites Produced by Mechanical Milling

Journal of Metastable and Nanocrystalline Materials, 2005

Aluminum-graphite-copper (Al-C-Cu) novel micro-composites have been produced using the Mechanical... more 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.

Research paper thumbnail of White Lines and Electron Occupancy for Ti 3d States in BaTiO3 by EELS

White Lines and Electron Occupancy for Ti 3d States in BaTiO3 by EELS

Microscopy and Microanalysis, 2007

Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Fl... more Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007

Research paper thumbnail of Characterization of Al-Based Composites Produced by Mechanical Milling Using Electron Energy Loss Spectroscopy

Characterization of Al-Based Composites Produced by Mechanical Milling Using Electron Energy Loss Spectroscopy

Journal of Metastable and Nanocrystalline Materials, 2005

Research paper thumbnail of EELS Characterization in AL-C-Al2O3 Composites Produced by MA

Microscopy and Microanalysis, 2004

A number of research works have been carried out in recent years to develop engineering materials... more A number of research works have been carried out in recent years to develop engineering materials that are stronger and more resistant that the available commercial materials. Metal matrix composites (MMCs) are regarded as excellent materials to obtain properties that ...

Research paper thumbnail of Electronic Structure of YFe2 by EELS and Ab Initio Calculations

Advanced Materials …, 2009

Centro de Investigación en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120, CP 31109, C... more Centro de Investigación en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120, CP 31109, Chihuahua, Chihuahua, México a emilio.yanez@cimav.edu.mx, b veronica.gallegos@cimav.edu.mx, c jose.matutes@cimav.edu.mx, d ...