Effect of copper and magnesium on the microstructure of centrifugally cast Al-19%Si alloys
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2018
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Materials Science Forum
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Hypereutectic Al-Si alloys can be used in applications that require high wear resistance.
Such wear resistance is achieved by the presence of hard primary silicon particles, allied to the
formation of Mg2Si intermetallic phase when magnesium is added in this alloy. Centrifugal casting
generates a gradient in the microstructure of hypereutectic Al-Si alloys that can favor such
applications. Cylindrical components of Al-19%Si alloy containing added copper and magnesium
contents were processed by centrifugal casting. The purpose of this study is to investigate the
formation and segregation of particles of primary silicon (β) and Mg2Si in Al-19%Si alloy
containing additions of copper and magnesium. Because the density of silicon (2.33 g/cm3) and
Mg2Si (1.88 g/cm3) is lower than that of aluminum (2.67 g/cm3), centrifugal casting causes primary
silicon (β) and Mg2Si particles to concentrate more at the outer wall of the centrifuged pipe. In this
study, primary silicon (β) and Mg2Si particles were found to be retained at the outer wall of the
pipe. It is believed that the rapid cooling of the molten metal in the region of contact with the mold,
whose temperature is lower than that of the molten metal, allied to the centrifugal force, prevented
the particles from migrating to the inner wall of the pipe. The microstructure shows a gradient in
the distribution of these phases, enabling the production of a functionally graded material. The
addition of copper and magnesium leads to the formation of Mg2Si and Al5Cu2Mg8Si6 phases,
reducing the amount of primary β phase (Si) particles. In all the evaluated conditions, a tendency is
also observed for a gradual increase in the segregation of silicon towards the inner wall along the
entire length of the centrifuged pipe.
Como referenciar
CONTATORI, CHESTER; COUTO, ANTONIO A.; VATAVUK, JAN; BORGES, ARNALDO A.C.; LIMA, NELSON B. de; BALDAN, RENATO. Effect of copper and magnesium on the microstructure of centrifugally cast Al-19%Si alloys. Materials Science Forum, v. 930, p. 484-488, 2018. DOI: 10.4028/www.scientific.net/MSF.930.484. Disponível em: http://repositorio.ipen.br/handle/123456789/29286. Acesso em: 24 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.