Author/Authors :
ghedjati, khadouja université me cherif mesaadia, souk ahras, algeria , ghedjati, khadouja université annaba - faculty of science - department of physiue, laboratoire des systèmes et des matériaux avancés (lasma), Annaba, Algeria , fleury, eric université de lorraine - le centre de recherche en automatique de nancy (cran) - laboratoire d’etude des microstructures et mécanique des matériaux (lem3), Metz, France , guellati, ouanassa université me cherif mesaadia, souk ahras, algeria , guellati, ouanassa université annaba - faculty of science - department of physiq, laboratoire d’etude et de recherche des etats condensés (lerec), Annaba, Algeria , samih, youcef université de lorraine - le centre de recherche en automatique de nancy (cran) - laboratoire d’etude des microstructures et mécanique des matériaux (lem3), Metz, France
Abstract :
In order to improve the mechanical properties of Al-Si13 alloys various treatments and procedures are recommended such as modification treatment of the molten alloy. In this work, the effects of the modification of the alloy composition owing to the addition of 1 wt.% and 2 wt.% modifier composed of 40 wt.% NaCl and 45 wt.% NaF and 15 wt.% KCl, combined with the application of unidirectional solidification by means of the Bridgman type were studied on the Al-Si13alloy. Microstructural analyses revealed a decrease in the interdendritic spacing(SDAS), in particular owing 2% of the modifier prepared with a reduced pulling traction. The dendrites were preferably oriented along the pulling velocity for fairly low pulling velocity (500 μm/s). These microstructural modifications enabled an increase of both the hardness (HB) values and the impact toughness.
NaturalLanguageKeyword :
AlSi13 alloy , Modification treatment , Directionally solidification , Bridgman technique , Silicon eutectic
