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Type: Artigo
Title: Length scale of the dendritic array tailoring strength of a 5052 aluminum alloy
Author: Ogata, Cinthia Toshimi
Reyes, Rodrigo Valenzuela
Garcia, Amauri
Spinelli, Jose Eduardo
Abstract: The present research aims to characterize 5xxx alloy series, considering chemistries based on the commercial 5052 alloy with three Mg contents (2.4wt.%, 2.6wt.% and 3.2wt.%) through transient directional solidification experiments. Very representative incoming impurities to a given twin-roll casting procedure were reached. As such, the Si, Fe, Cu, Mn and Cr-contents in the tested samples typically trend in between the suitable alloying spectrum. Microstructural analyzes were performed using polarized light microscopy of samples taken from various ingot positions. Growth relationships between the secondary dendritic spacing (lambda(2)) and the growth velocity were determined. The 5052 alloys containing higher Mg content may induce a decrease in lambda(2) for a certain growth velocity. The hardness values measured across the three directionally solidified castings were directly related to the lambda(2), which can be considered a fundamental variable affecting mechanical strength. For representative conditions vis-a-vis those employed in industry, it was shown that even relatively small changes in Mg content of the 5052 alloy may have some impact on lambda(2). These results open new ways to predict the final as-cast microstructure characterizing commercial 5052 alloy products, with a view to controlling not only the dendritic growth but also the Mg content during casting operations
Subject: Microestrutura
Compostos intermetálicos
Country: Brasil
Editor: UFSCar/Departamento de Engenharia de Materiais
Rights: Aberto
Identifier DOI: 10.1590/1980-5373-MR-2018-0561
Date Issue: 2019
Appears in Collections:FEM - Artigos e Outros Documentos

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