Correlação teórico experimental entre parâmetros térmicos e estruturas dendríticas na solidificação unidirecional da liga Al-5%Si

Abstract

Solidification structures in gross, to establish correlations between microstructure and mechanical properties arising, is a complex task that begins by analyzing the different microstructural features, such as grain size, solidification microstructures, inclusions, porosity, etc. Some works of literature argue that the size of the interdendritic spacing is more important than the grain size to the mechanical properties resulting from microstructural design. On the other hand, the dendrite arm spacing depends on thermal conditions during the solidification process and parameters such as speed of the liquidus isotherm (VL), cooling rate (T ) and solute content (C0) in the dendrite arm spacing, hence the importance of being able to have a quantitative manner that allows expression of this interdependence. Thus the present work is therefore to go all the way from the unidirectional solidification of an alloy Al-5% Si at different solidification conditions such as variations in the superheat of 2 ° C, 10º C and 20 ° C and conditions heat extraction plate mold (Polite and Shielded), record the temperature evolution along the process, raise experimentally the thermal parameters of solidification and establish correlations with the microstructure and thermal parameters of solidification.