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Otávio L. Rocha

Researcher at Federal University of Pará

Publications -  71
Citations -  987

Otávio L. Rocha is an academic researcher from Federal University of Pará. The author has contributed to research in topics: Directional solidification & Microstructure. The author has an hindex of 14, co-authored 66 publications receiving 841 citations. Previous affiliations of Otávio L. Rocha include São Paulo Federal Institute of Education, Science and Technology & State University of Campinas.

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Heat flow parameters affecting dendrite spacings during unsteady-state solidification of Sn-Pb and Al-Cu alloys

TL;DR: In this paper, the Bouchard-Kirkaldy (BK) equation relating secondary spacings with tip growth rate has been used to determine the dendritic sparsities of Sn-Pb and Al-Cu alloys.
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Effect of solution time in T6 heat treatment on microstructure and hardness of a directionally solidified Al–Si–Cu alloy

TL;DR: In this paper, an experimental investigation on the role of solution time during 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%Si-3.0%Cu alloy samples is performed.
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Cellular/dendritic transition during unsteady-state unidirectional solidification of Sn–Pb alloys

TL;DR: In this paper, the authors determine the thermal solidification parameters affecting the cellular/dendritic transition as well as compare theoretical models that predict cellular and primary dendritic spacings with experimental results for unsteady-state solidification.
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Cellular spacings in unsteady-state directionally solidified Sn–Pb alloys

TL;DR: In this paper, the insertion of analytical expressions for tip growth rate and cooling rate into the resulting experimental equations permitting to establish empirical formulae relating cellular spacings with unsteady-state solidification parameters like: melt superheat, type of mold and transient metal/mold heat transfer coefficient.
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The effect of solidification variables on tertiary dendrite arm spacing in unsteady-state directional solidification of Sn–Pb and Al–Cu alloys

TL;DR: In this paper, the effect of initial alloy composition on tertiary dendritic spacing was analyzed and the insertion of analytical expressions for cooling rate into the resulting experimental equations permitting to establish empirical formulae relating tertiary Dendrite spacing with unsteady-state solidification parameters like: melt superheat, type of mold and transient metal/mold heat transfer coefficient is proposed.