SANTOS, G.A.GOULART, P.R.COUTO, A.A.GARCIA, A.OCHSNER, ANDREASALTENBACH, HOLM2016-11-092016-11-092017SANTOS, 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.). <b>Properties and characterization of modern materials</b>. Singapura: Springer, 2017. p. 215-229. Disponível em: http://repositorio.ipen.br/handle/123456789/26764.http://repositorio.ipen.br/handle/123456789/26764The 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.215-229closedAccessaluminium alloyscopper alloyslithium alloysmechanical propertiessolidificationcorrelationsmicrostructurephase diagramsremovalCapítulo de livro