Resumen

MARTINEZ, E; LACAZE, J; CISNEROS, M  y  VALTIERRA, S. EFECTO DEL ESTRONCIO EN LAS TEMPERATURAS DE REACCION EUTECTICAS Y MICROESTRUCTURAS DE SOLIDIFICACION DE UNA ALEACION Al-Si TIPO A319. Rev. Fac. Ing. - Univ. Tarapacá [online]. 2004, vol.12, n.2, pp. 21-26. ISSN 0718-1337.  doi: 10.4067/S0718-13372004000200004.

This work was carried out over a basic Al-Si-Cu alloy, widely used in the automotive industry for  production of monoblocks and motor heads. Differential thermal analysis (DTA) was used to determine the reaction temperatures from beginning  to end of the solidification process of alloy type A319 , using three cooling rates (2, 10, and 20 ^oC/min) on samples with 12 and 136 ppm of Sr as modifying agent. Three eutectic reactions were found, one of these reactions corresponds to eutectic reaction of phases rich in copper and it was also found that the reaction temperature decreases when the cooling rate increases and also when the strontium content increases. Microanalysis using electron microscopy sacnning was performed, to determine the element distribution in the resulting phases

Palabras clave : Strontium; differential thermal analysis; Aluminum alloy A319; Eutectic reaction.