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Type: Artigo
Title: Thixoformability analysis of 355 aluminum alloy
Author: Paula, Leandro Cássio de
Brollo, Gabriela Lujan
Proni, Cecília Tereza Weishaupt
Zoqui, Eugênio José
Abstract: SSM processing typically uses aluminum alloys with a high Si content as raw material. Alloys with a medium Si content, such as 355 (Al–5 wt.%Si–1.0 wt.%Cu–0.6 wt.%Fe–0.4 wt.%Mg), are extensively used in casting operations, but little is used in SSM applications. This study therefore sought to determine by thermodynamic, microstructural, and rheological evaluation whether a grain-refined 355 alloy is suitable raw material for thixoforming operations. Ingots were produced using a grain refiner (Al–5.0 wt.%Ti–1.0 wt.%B) and electromagnetic stirring. The thermodynamic behavior of the alloy was analyzed by means of thermodynamic simulation (Thermo-Calc®) and DSC at several heating rates. 355 semisolid slurry was then produced by reheating the alloy to 595 °C and partially melting it for 0, 30, 60, 90, and 120 s to produce a spheroidized microstructure, which was evaluated by optical microscopy. The rheological behavior of the slurry was evaluated by viscosity and stress measurements during thixoforging tests. The results show that the grain-refined 355 alloy is suitable for thixoforming as it has stable microstructural and rheological behavior over a broad temperature range in the semisolid state, a desirable characteristic for SSM processing control
Subject: Microestrutura
Country: Estados Unidos
Editor: Springer
Rights: Fechado
Identifier DOI: 10.1007/s13632-017-0411-4
Date Issue: 2018
Appears in Collections:FEM - Artigos e Outros Documentos

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