Effect of solution time in T6 heat treatment on microstructure and hardness of a directionally solidified Al–Si–Cu alloy
Thiago A. Costa, Marcelino Dias, Laércio G. Gomes, Otávio L. Rocha, Amauri Garcia
ARTIGO
Inglês
Agradecimentos: The authors acknowledge the financial support provided by IFPA (Federal Institute of Education, Science and Technology of Pará), FAPESP – São Paulo Research Foundation, Brazil (grants 2013/09267-0; 2013/23396-7 and 2014/50502-5) and CNPq (The Brazilian Research Council)
An experimental investigation on the role of solution time during the T6 heat treatment on the scale of the secondary dendrite arm spacing (λ2), morphology and distribution of Si particles and Al2Cu intermetallics and the resulting effect on microhardness of Al-5.5 wt%Si-3.0 wt%Cu alloy samples is...
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An experimental investigation on the role of solution time during the T6 heat treatment on the scale of the secondary dendrite arm spacing (λ2), morphology and distribution of Si particles and Al2Cu intermetallics and the resulting effect on microhardness of Al-5.5 wt%Si-3.0 wt%Cu alloy samples is performed. A directionally solidified (DS) casting was previously obtained using a water-cooled apparatus, which permitted a wide range of cooling rates () to be associated with samples having quite different microstructural parametric features. An experimental growth law relating λ2 to is proposed. The T6 heat treatment was then carried out on the DS samples for different solution times: 8 h and 5 h at 490 ± 2 °C, followed by quenching in warm water (60 ± 2 °C), ageing for 5 h at 155 ± 2 °C and air-cooling. The microstructure characterization (optical and scanning electron microscopies) has shown that λ2 was only affected (when compared with those of the DS casting samples) when the solution time increased from 5 h to 8 h. In contrast, significant influences on the morphology and distribution of both Si and Al2Cu particles are shown to occur. The highest hardness is shown to be associated with a sample subjected to the 5 h treatment, having lowest λ2 and appropriate modification of Si and Al2Cu particles
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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2013/09267-0; 2013/23396-7; 2014/50502-5
Fechado
Effect of solution time in T6 heat treatment on microstructure and hardness of a directionally solidified Al–Si–Cu alloy
Thiago A. Costa, Marcelino Dias, Laércio G. Gomes, Otávio L. Rocha, Amauri Garcia
Effect of solution time in T6 heat treatment on microstructure and hardness of a directionally solidified Al–Si–Cu alloy
Thiago A. Costa, Marcelino Dias, Laércio G. Gomes, Otávio L. Rocha, Amauri Garcia
Fontes
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Journal of alloys and compounds. An interdisciplinary journal of materials science and solid-state chemistry and physics Vol. 683 (Oct., 2016), p. 485-494 |