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Rem: Revista Escola de Minas

Print version ISSN 0370-4467


CARVALHO, Diego de Leon Brito et al. Solidification thermal parameters and dendritic growth during the horizontal directional solidification of Al-7wt.%Si alloy. Rem: Rev. Esc. Minas [online]. 2014, vol.67, n.3, pp.265-270. ISSN 0370-4467.

The main purpose of this work is to investigate the influence of thermal parameters such as growth rate (VL) and cooling rate (TR) on the primary dendrite arm spacings (λ1) during the horizontal transient directional solidification of Al-7wt.%Si hypoeutectic alloy. The primary dendrite spacings were measured along the length of the samples and correlated with these thermal parameters. The variation of dendrite spacings is expressed as a power law function of VL and TR given by the formulas λ1 = 55(VL)-1.1 and λ1 = 212 (TR)-0.55, respectively. A comparative study between the results of this work and those from the literature proposed to investigate these dendrite spacings during the upward and downward vertical directional solidification of Al-7wt.%Si alloy is also conducted. Finally, the experimental data are compared with some predictive dendritic models from the literature.

Keywords : Directional solidification; unsteady state; primary dendrite arm spacings; Al-Si alloys.

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