B Pourbahari - School of Metallurgy and Materials, College of Engineering, University of Tehran, P.O. Box ۱۴۳۹۵-۷۳۱, Tehran, Iran
M Emamy - School of Metallurgy and Materials, College of Engineering, University of Tehran, P.O. Box ۱۴۳۹۵-۷۳۱, Tehran, Iran
M Khosravi - Department of Materials Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran
M Lotfpour - School of Metallurgy and Materials, College of Engineering, University of Tehran, P.O. Box ۱۴۳۹۵-۷۳۱, Tehran, Iran

This work carried out to investigate the effect of different amounts of Ti (0.01, 0.05, 0.1 and 0.5) and cooling rate on Al-4%Cu-3%Si alloy. The samples were examined by using optical microscopy (OM) and tensile testing to evaluate the modification efficiency of the alloy with different Ti contents. The optimum level Ti as Al–5Ti–1B grain refiners was found. Decreases grain size and dendrite arm spacing due to increasing cooling rate and Ti grain refiner through reduced sections. Increasing cooling rate results in higher strength and Ti-refined specimens showed highest tensile strength and elongation values

Aluminium alloys; Casting; Grain refinement