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 2016/18186-1 and 2017/15158-0), and CNPq, The Brazilian Research Council (grants 301600/2015-5;...

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 2016/18186-1 and 2017/15158-0), and CNPq, The Brazilian Research Council (grants 301600/2015-5; 472745/2013-1 and 308784/2014-6).

Horizontal directional solidification experiments were carried out with a monophasic Sn-2%Sb (mass fraction) alloy to analyze the influence of solidification thermal parameters on the morphology and length scale of the microstructure. Continuous temperature measurements were made during...

Horizontal directional solidification experiments were carried out with a monophasic Sn-2%Sb (mass fraction) alloy to analyze the influence of solidification thermal parameters on the morphology and length scale of the microstructure. Continuous temperature measurements were made during solidification at different positions along the length of the casting and these temperature data were used to determine solidification thermal parameters, including the growth rate (VL) and the cooling rate (TR). High cooling rate cells and dendrites are shown to characterize the microstructure in different regions of the casting, with a reverse dendrite-to-cell transition occurring for TR>5.0 K/s. Cellular (lc) and primary dendrite arm spacings (l1) are determined along the length of the directionally-solidified casting. Experimental growth laws relating lc and l1 to VL and TR are proposed, and a comparative analysis with results from a vertical upward directional solidification experiment is carried out. The influence of morphology and length scale of the microstructure on microhardness is also analyzed

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ

301600/2015-5; 472745/2013-1; 308784/2014-6

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

2016/18186-1; 2017/15158-0

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