Agradecimentos: The authors would like to thank the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (Projects 2013- 09961-3 and 2015-22143-3), the Conselho Nacional de Desenvolvimento Científco e Tecnológico (CNPq) (Projects PQ:306896/2013-3), and Coordenação de Aperfeiçoamento de...

Agradecimentos: The authors would like to thank the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (Projects 2013- 09961-3 and 2015-22143-3), the Conselho Nacional de Desenvolvimento Científco e Tecnológico (CNPq) (Projects PQ:306896/2013-3), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior for providing fnancial support. We would also like to thank the School of Mechanical Engineering at the University of Campinas (UNICAMP)

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...

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

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

2013- 09961-3; 2015-22143-3

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ

306896/2013-3

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