Primary dendrite arm spacing effects upon mechanical properties of an Al–3wt%Cu–1wt%Li alloy

Tipo
Artigo de evento
Data de publicação
2017
Periódico
Advanced Structured Materials
Citações (Scopus)
16
Autores
Santos G.A.
Goulart P.R.
Couto A.A.
Garcia A.
Orientador
Título da Revista
ISSN da Revista
Título de Volume
Membros da banca
Programa
Resumo
© Springer Science+Business Media Singapore 2017.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 (Ṫ), primary dendrite arm spacing (λ1), ultimate tensile strength (σUTS) and yield strength (σy) 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 (σUTS and σy = 0.2 %ε), the finer dendritic arrangement presents superior mechanical properties.
Descrição
Palavras-chave
Assuntos Scopus
Citação
DOI (Texto completo)