Color Metallography and Electron Microscopy Techniques Applied to the Characterization of 413.0 Aluminum Alloys

Voort, George Vander; Lozano, José Antonio Flórez; Suárez-Peña, Beatriz

doi:10.1017/s1431927613000585

Cited by 4 publications

(3 citation statements)

References 24 publications

(25 reference statements)

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“…Determinations were carried out via the application of Quantitative Stereological Principles [23,24]. A manual point counting technique was used to obtain the volume fraction [25,26,27]. To perform this test, a grid composed of points was superposed over the microstructure.…”

Section: Methodsmentioning

confidence: 99%

Imaging Techniques and Scanning Electron Microscopy as Tools for Characterizing a Si-Based Material Used in Air Monitoring Applications

et al. 2016

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This paper presents a study of the quartz fibrous filters used as a substrate for capturing the particulate matter (PM) present in the air. Although these substrates are widely used in environmental applications, their microstructure has been barely studied. The behavior of these devices during the filtration process was investigated in terms of their microstructure and the quartz fibers. Surface and cross sections were monitored. Scanning electronic microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), imaging and stereology techniques were used as tools for this purpose. The results show that most of the quartz filter fibers have sizes that allow them to be classified as nanofibers. It was also observed that, while the mechanisms of the mechanical capture of particles via impaction, interception and diffusion operate simultaneously in the outer zones of the filter cross section, the mechanism of capture by impaction is virtually non-existent in the innermost zones. Particles between 0.1 and 0.5 μm are known to be the most difficult to have captured by means of fibrous substrates. The fibers in inner zones were highly efficient in capturing this type of particle.

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Section: Methodsmentioning

confidence: 99%

Imaging Techniques and Scanning Electron Microscopy as Tools for Characterizing a Si-Based Material Used in Air Monitoring Applications

et al. 2016

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“…In this study, it was observed that the applied pressure promotes significant refinement of α -Al grains during solidification (Vander Voort et al, 2013). In fact, when the alloy solidifies under atmospheric pressure (0.1 MPa), the mean grain size, evaluated via the mean area size ( ), was found to be equal to 11,296 µ m 2 .…”

Section: Discussionmentioning

confidence: 87%

“…The polishing and etching details have been reported in previous works by Vander Voort et al (Vander Voort, 1981; Warmuzek, 2004; Vander Voort et al, 2013).…”

Section: Materials and Experimental Proceduresmentioning

confidence: 91%

Metallographic Assessment of Al-12Si High-Pressure Die Casting Escalator Steps

Voort¹,

Suárez-Peña²,

Lozano³

2014

Microsc Microanal

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A microstructural characterization study was performed on high-pressure die cast specimens extracted from escalator steps manufactured from an Al-12 wt.% Si alloy designed for structural applications. Black and white, color light optical imaging and scanning electron microscopy techniques were used to conduct the microstructural analysis. Most regions in the samples studied contained globular-rosette primary α-Al grains surrounded by an Al-Si eutectic aggregate, while primary dendritic α-Al grains were present in the surface layer. This dendritic microstructure was observed in the regions where the melt did not impinge directly on the die surface during cavity filling. Consequently, microstructures in the surface layer were nonuniform. Utilizing physical metallurgy principles, these results were analyzed in terms of the applied pressure and filling velocity during high-pressure die casting. The effects of these parameters on solidification at different locations of the casting are discussed.

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Automated color etching of aluminum alloys

Ambrož

Čermák

Jozefovič

et al. 2022

Practical Metallography

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Color metallography of aluminum alloys can provide new structural knowledge or extend and refine structural knowledge compared to a black and white image. The basic principle of color metallography is to create a suitable film by etching. On samples coated with a suitable film, light interference is caused by the splitting of the incident light into components reflected at the air-layer interface and the layer-metal interface. The thickness of the film essentially determines at which colors the interference occurs. For films of suitable thickness, interference occurs in the blue, green and yellow regions. The film thickness depends on the chemical composition of the sample material, the chemical composition of the etchant and the etching time. If the etching conditions are kept constant (etchant type, etching time) and the chemical composition of the individual micro-areas changes significantly, it will be possible to distinguish the microareas by color contrast in the bright field. The results of color etching of aluminum alloys in different types of etchants will be presented. Using an automated apparatus, the same etching conditions will be maintained, including time and repeatability of movements in the etching, cleaning and drying process.

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Color Metallography and Electron Microscopy Techniques Applied to the Characterization of 413.0 Aluminum Alloys

Cited by 4 publications

References 24 publications

Imaging Techniques and Scanning Electron Microscopy as Tools for Characterizing a Si-Based Material Used in Air Monitoring Applications

Imaging Techniques and Scanning Electron Microscopy as Tools for Characterizing a Si-Based Material Used in Air Monitoring Applications

Metallographic Assessment of Al-12Si High-Pressure Die Casting Escalator Steps

Automated color etching of aluminum alloys

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