Primary dendrite ARM spacing effects upon mechanical properties of an AL-3Wt%CU-1Wt%LI alloy
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Properties and characterization of modern materials
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Resumo
The imposition of a wide range of operational conditions in foundry and
castings processes generates, as a direct consequence, a diversity of solidification
structures. It is well known that mechanical properties depend on solidification
structures. The literature presents relationships between yield strength and grain
size, such as the Hall-Petch’s equation, or ultimate tensile strength and dendrite arm
spacing. In this work, an Al–3wt%Cu–1wt%Li alloy was solidified under upward
unsteady state heat flow conditions. Heat was directionally extracted only through a
water-cooled bottom made of steel (SAE 1020). The aim of the present study is to
obtain correlations between the as-cast microstructure, solidification thermal variables
and mechanical properties of an Al–3wt%Cu–1wt%Li alloy casting. The
results include tip growth rate (VL), cooling rate (T_ ), primary dendrite arm spacing
(k1), ultimate tensile strength (rUTS) and yield strength (ry) as a function of
solidification conditions imposed by the metal/mold system. It is found that the
primary dendrite arm spacing decreases with the increase in tip growth rate and
cooling rate. In both cases (rUTS and ry = 0.2 %e), the finer dendritic arrangement
presents superior mechanical properties.
Como referenciar
SANTOS, G.A.; GOULART, P.R.; COUTO, A.A.; GARCIA, A. Primary dendrite ARM spacing effects upon mechanical properties of an AL-3Wt%CU-1Wt%LI alloy. In: OCHSNER, ANDREAS (ed.); ALTENBACH, HOLM (ed.). Properties and characterization of modern materials. Singapura: Springer, 2017. p. 215-229. Disponível em: http://repositorio.ipen.br/handle/123456789/26764. Acesso em: 30 Dec 2025.
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.