Fractal and Conventional Analysis of Cu Content Effect on the Microstructure of Al-Si-Cu-Mg Alloys

This work analyzes the effect of Cu additions on the microstructure of quaternary alloys Al-6Si-7Mg-xCu (x= 3, 5 and 7 wt.%) produced by conventional metallurgy. Microstructural modifications were studied using Optical Microscopy (OM), X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM),...

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Bibliographic Details
Published in:	Materials research (São Carlos, São Paulo, Brazil) Vol. 23; no. 4; p. 1
Main Authors:	Casas, Bertha Y., Carranza, Juan C., Figueroa, Ignacio A., González, Jose G., Hernáncdez, Orlando, Béjar, Luis, Aguilar, Claudio, Alfonso, Ismeli
Format:	Journal Article
Language:	English
Published:	Sao Carlos Universidade Federal do Sao Carlos, Departamento de Engenharia de Materiais 01-01-2020 ABM, ABC, ABPol Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
Subjects:	Al alloys Aluminum base alloys Aspect ratio Compression tests Compressive properties Copper Copper base alloys Diameters ENGINEERING, CHEMICAL fractal Fractal analysis Fractal geometry Fractals MATERIALS SCIENCE, MULTIDISCIPLINARY mechanical properties Metallurgical analysis METALLURGY & METALLURGICAL ENGINEERING Microstructure Morphology Optical microscopy Parameter modification Phases Quaternary alloys Roundness Scanning electron microscopy second phases SEM Shape factor Silicon X-ray diffraction fractal second phases SEM microstructure Al alloys mechanical properties
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Summary:	This work analyzes the effect of Cu additions on the microstructure of quaternary alloys Al-6Si-7Mg-xCu (x= 3, 5 and 7 wt.%) produced by conventional metallurgy. Microstructural modifications were studied using Optical Microscopy (OM), X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM), focusing on second phases identification and quantification. Conventional image analyses were developed measuring the total percentage of second phases, and individually for each phase determining its equivalent diameter, shape factor, roundness and aspect ratio; while fractal analyses were carried out complementarily through fractal dimension measurements for the whole microstructure and for individual phases. Compression tests were also carried out. SEM and XRD results revealed that second phases were eutectic Si, Mg2 Si, Al2 Cu and Al5 Cu2 Mg8 Si6 (Q). The increase in Cu content led to higher quantities of these phases, mainly Al2 Cu, which was barely present for the alloy with the lowest Cu content. Morphologies of second phases depended on Cu content, being present as eutectic, block like, finely dispersed or primary particles. The combination of conventional and fractal parameters provided a useful tool for comparatively analyze microstructural modifications and second phases features. It was also found that the compressive behavior of the alloys depended on the resulting microstructures.
ISSN:	1516-1439 1980-5373 1980-5373
DOI:	10.1590/1980-5373-mr-2019-0666