Agradecimentos: The authors acknowledge the financial supports provided by FAPESP (São Paulo Research Foundation, Brazil: grant number 2017/12741-6), National Council for Scientific and Technological Development - CNPq and CAPES

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...

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

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

2017/12741-6

COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES

Aberto