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The influence of melt convection on dendritic spacing of downward unsteady-state directionally solidified Sn-Pb alloys

Author(s): Spinelli José Eduardo | Rocha Otávio Fernandes Lima | Garcia Amauri

Journal: Materials Research
ISSN 1516-1439

Volume: 9;
Issue: 1;
Start page: 51;
Date: 2006;
Original page

Keywords: downward unidirectional solidification | dendritic spacings | dendritic growth models | Sn-Pb alloys

Microstructures are the strategic link between materials processing and materials behavior. A dendritic structure is the most frequently observed pattern of solidified alloys. The microstructural scales of dendrites, such as primary and secondary arm spacings, control the segregation profiles and the formation of secondary phases within interdendritic regions, determine the properties of cast structures. In this work, the influence of thermosolutal convection on dendrite arm spacings is experimentally examined in the downward vertical unsteady-state directional solidification of Sn-Pb hypoeutectic alloys. The experimental observations are compared not only with the main predictive theoretical models for dendritic spacings but also with experimental results obtained for Sn-Pb alloys solidified vertically upwards. Primary dendritic arm spacings have been affected by the direction of growth, decreasing in conditions of downward vertical solidification when compared with those grown vertically upwards. Further, the unsteady-state lambda1 predictive models did not generate the experimental observations.

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