Carlos Caceres - Academia.edu (original) (raw)

Carlos Caceres

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Papers by Carlos Caceres

Research paper thumbnail of Intermetallics Distribution in Two and Three Dimensions in High Pressure Die Cast AZ91 Alloy

Scanning Electron Microscope (SEM) and DUalBeam FIB (Focussed Ion Beam) were used to characterize... more Scanning Electron Microscope (SEM) and DUalBeam FIB (Focussed Ion Beam) were used to characterize the intermetallic microstructure in 2D and 3D, respectively. The intermetallic appears as a closely interconnected network with very fine scale near the surface, while it takes a more open structure in the core regions of the casting. The possible effects of this difference in the scale of the intermetallic structure on the mechanical behaviour of the material are discussed.

Research paper thumbnail of Elastic Behavior of the Percolating Eutectic Structure of a High Pressure Die Cast Magnesium Alloy

De Graef/1 st International, 2012

Research paper thumbnail of On the effect of macroporosity on the tensile properties of the Al-7%Si-0.4%Mg casting alloy

Scripta Metallurgica et Materialia

Jntrot&tion ~~~dparosityonthetensileprapertiesofacastinghas,beentlaematterofseverslstudies,n~~~ a... more Jntrot&tion ~~~dparosityonthetensileprapertiesofacastinghas,beentlaematterofseverslstudies,n~~~ and Smith(l), Henera and Kondic(2) aud Surappa et aL(3). Eady and Smith(l) studied tbe effect of large average volume &&ions of-, up to 7%, cQ the mechanical behaviour ofAL7%Si with Mg levels of 0.1-0.47%. They foundthatcntytfielowcr~low-yieldskssvarietiesofthe alloy (l~thauO.25%Mg) cantoleratepomsilylevels

Research paper thumbnail of Grain growth at low strain rates in a superplastic Cu alloy

Research paper thumbnail of Large strain behaviour of a superplastic copper alloy—I. Deformation

Acta Metallurgica

ABSTRACT

Research paper thumbnail of On the mechanism of strain-enhanced grain growth during superplastic deformation

Acta Metallurgica

ABSTRACT

Research paper thumbnail of A phenomenological approach to the Quality Index of Al-Si-Mg casting alloys

International Journal of Cast Metals Research

ABSTRACT

Research paper thumbnail of Material properties and process assessment in Mg-Al casting alloys using strength—ductility charts

International Journal of Cast Metals Research

ABSTRACT

Research paper thumbnail of Selection of temper and Mg content to optimise the Quality Index of Al-7Si-Mg casting alloys

International Journal of Cast Metals Research

ABSTRACT

Research paper thumbnail of Mechanism of plastic void growth during superplastic flow

Materials Science and Technology

Existing models for plastic hole growth have been re-evaluated in terms of their applicability to... more Existing models for plastic hole growth have been re-evaluated in terms of their applicability to superplastic flow. The Cocks and Ashby model is modified to include more properly the effect of void shape, and the effect of simultaneous strain hardening is also discussed. Some new experimental data on the growth of artificial holes drilled in a sheet sample of Coronze 638 are presented and compared with data on the development of general cavitation damage in the same material without artificial holes. The difference between the two sets of results is explained in terms of a coalescence effect during general damage. Cavitation rates are found to be independent of strain in both sets of experiments. This result is explained by including the effect of strain hardening (brought about by strain enhanced grain growth) in the models.

Research paper thumbnail of Strength-Ductility Behaviour of Al-Si-Cu-Mg Casting Alloys in T6 Temper

International Journal of Cast Metals Research

Research paper thumbnail of Dendrite cell size and ductility of Al—Si—Mg casting alloys: Spear and Gardner revisited

International Journal of Cast Metals Research

ABSTRACT

Research paper thumbnail of A rationale for the quality index of Al-Si-Mg casting alloys

International Journal of Cast Metals Research

ABSTRACT

Research paper thumbnail of 3D characterization of intennetallics in a high pressure die cast Mg alloy using focused ion beam tomography

Materials Characterization, 2010

Research paper thumbnail of Modelling microplastic flow in an hpdc Mg-Al alloy

Research paper thumbnail of The skin effect and the yielding behavior of cold chamber high pressure die cast Mg-A1 alloys

Materials Science Engineering a Structural Materials Properties Microstructure and Processing P, 2012

ABSTRACT The volume fraction of material that remained elastic as yielding developed in cast-to-s... more ABSTRACT The volume fraction of material that remained elastic as yielding developed in cast-to-shape tensile specimens of binary alloys with Al contents between 0.47 and 11.6 mass% was calculated using the Kocks–Mecking method of analysis. In the most dilute alloys the elastic fraction decreased rapidly to zero at a well-defined stress, suggesting that yielding was uniform across the specimen, whereas in the concentrated ones it decreased gradually over a wide range of stresses, suggesting that yielding developed first in the softer core of the casting while the harder outer layer, or skin, remained elastic. Comparison with specimens of the concentrated alloys which had a surface layer removed showed that the strain hardening behavior of the core resembled that of full specimens of the most dilute alloy. The maximum amount of elastic material in comparison with the most dilute alloy was used to define the area fraction covered by the skin, for each alloy. The skin covered between ∼10% and ∼30% of the cross section, the greater values for the concentrated alloys. The skin imposed an elastic constraint that delayed the development of full plasticity at the core.

Research paper thumbnail of A novel technique for growth of single crystals from wide solidication range alloys

Research paper thumbnail of On the relation between hardness and yield strength in a sand cast AZ91 alloy

Research paper thumbnail of The effecct of Cu content on the formation of microporosity in Al-Si-Cu-Mg casting alloys

Research paper thumbnail of Quality index charts for Mg-based casting alloys

Research paper thumbnail of Intermetallics Distribution in Two and Three Dimensions in High Pressure Die Cast AZ91 Alloy

Scanning Electron Microscope (SEM) and DUalBeam FIB (Focussed Ion Beam) were used to characterize... more Scanning Electron Microscope (SEM) and DUalBeam FIB (Focussed Ion Beam) were used to characterize the intermetallic microstructure in 2D and 3D, respectively. The intermetallic appears as a closely interconnected network with very fine scale near the surface, while it takes a more open structure in the core regions of the casting. The possible effects of this difference in the scale of the intermetallic structure on the mechanical behaviour of the material are discussed.

Research paper thumbnail of Elastic Behavior of the Percolating Eutectic Structure of a High Pressure Die Cast Magnesium Alloy

De Graef/1 st International, 2012

Research paper thumbnail of On the effect of macroporosity on the tensile properties of the Al-7%Si-0.4%Mg casting alloy

Scripta Metallurgica et Materialia

Jntrot&tion ~~~dparosityonthetensileprapertiesofacastinghas,beentlaematterofseverslstudies,n~~~ a... more Jntrot&tion ~~~dparosityonthetensileprapertiesofacastinghas,beentlaematterofseverslstudies,n~~~ and Smith(l), Henera and Kondic(2) aud Surappa et aL(3). Eady and Smith(l) studied tbe effect of large average volume &&ions of-, up to 7%, cQ the mechanical behaviour ofAL7%Si with Mg levels of 0.1-0.47%. They foundthatcntytfielowcr~low-yieldskssvarietiesofthe alloy (l~thauO.25%Mg) cantoleratepomsilylevels

Research paper thumbnail of Grain growth at low strain rates in a superplastic Cu alloy

Research paper thumbnail of Large strain behaviour of a superplastic copper alloy—I. Deformation

Acta Metallurgica

ABSTRACT

Research paper thumbnail of On the mechanism of strain-enhanced grain growth during superplastic deformation

Acta Metallurgica

ABSTRACT

Research paper thumbnail of A phenomenological approach to the Quality Index of Al-Si-Mg casting alloys

International Journal of Cast Metals Research

ABSTRACT

Research paper thumbnail of Material properties and process assessment in Mg-Al casting alloys using strength—ductility charts

International Journal of Cast Metals Research

ABSTRACT

Research paper thumbnail of Selection of temper and Mg content to optimise the Quality Index of Al-7Si-Mg casting alloys

International Journal of Cast Metals Research

ABSTRACT

Research paper thumbnail of Mechanism of plastic void growth during superplastic flow

Materials Science and Technology

Existing models for plastic hole growth have been re-evaluated in terms of their applicability to... more Existing models for plastic hole growth have been re-evaluated in terms of their applicability to superplastic flow. The Cocks and Ashby model is modified to include more properly the effect of void shape, and the effect of simultaneous strain hardening is also discussed. Some new experimental data on the growth of artificial holes drilled in a sheet sample of Coronze 638 are presented and compared with data on the development of general cavitation damage in the same material without artificial holes. The difference between the two sets of results is explained in terms of a coalescence effect during general damage. Cavitation rates are found to be independent of strain in both sets of experiments. This result is explained by including the effect of strain hardening (brought about by strain enhanced grain growth) in the models.

Research paper thumbnail of Strength-Ductility Behaviour of Al-Si-Cu-Mg Casting Alloys in T6 Temper

International Journal of Cast Metals Research

Research paper thumbnail of Dendrite cell size and ductility of Al—Si—Mg casting alloys: Spear and Gardner revisited

International Journal of Cast Metals Research

ABSTRACT

Research paper thumbnail of A rationale for the quality index of Al-Si-Mg casting alloys

International Journal of Cast Metals Research

ABSTRACT

Research paper thumbnail of 3D characterization of intennetallics in a high pressure die cast Mg alloy using focused ion beam tomography

Materials Characterization, 2010

Research paper thumbnail of Modelling microplastic flow in an hpdc Mg-Al alloy

Research paper thumbnail of The skin effect and the yielding behavior of cold chamber high pressure die cast Mg-A1 alloys

Materials Science Engineering a Structural Materials Properties Microstructure and Processing P, 2012

ABSTRACT The volume fraction of material that remained elastic as yielding developed in cast-to-s... more ABSTRACT The volume fraction of material that remained elastic as yielding developed in cast-to-shape tensile specimens of binary alloys with Al contents between 0.47 and 11.6 mass% was calculated using the Kocks–Mecking method of analysis. In the most dilute alloys the elastic fraction decreased rapidly to zero at a well-defined stress, suggesting that yielding was uniform across the specimen, whereas in the concentrated ones it decreased gradually over a wide range of stresses, suggesting that yielding developed first in the softer core of the casting while the harder outer layer, or skin, remained elastic. Comparison with specimens of the concentrated alloys which had a surface layer removed showed that the strain hardening behavior of the core resembled that of full specimens of the most dilute alloy. The maximum amount of elastic material in comparison with the most dilute alloy was used to define the area fraction covered by the skin, for each alloy. The skin covered between ∼10% and ∼30% of the cross section, the greater values for the concentrated alloys. The skin imposed an elastic constraint that delayed the development of full plasticity at the core.

Research paper thumbnail of A novel technique for growth of single crystals from wide solidication range alloys

Research paper thumbnail of On the relation between hardness and yield strength in a sand cast AZ91 alloy

Research paper thumbnail of The effecct of Cu content on the formation of microporosity in Al-Si-Cu-Mg casting alloys

Research paper thumbnail of Quality index charts for Mg-based casting alloys

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