In this work, bonding of Al6061 to Al2024 dissimilar aluminum alloy by transient liquid phase bonding and the effect of bonding time and temperature on bonding was investigated. At the first 2024 aluminum alloy samples with 3mm of thickne and 6061 aluminum alloy samples with 2mm of thickness were cut in size of 10×50 and the surface of these samples were prepared by grinding down to 1200 grit and then cleansed with acetone. As the interlayer for this work, a thin (50 ?m) foil of Cu was applied. This interlayer was placed between the parent metals in an acetone bathe and were fixed in the steel fixture. The samples in 9 series were bonded in the 550 °C, 580 °C and 600 °C of temperature and 30min, 45min and 60min of time in a vacuum furnace with the pressure of 10 -2 mbar. The cooling process of samples have done in furnace under vacuum. After bonding process, samples were cut to four parts which three parts for mechanical tests and one part for metallography test were used. For investigation of microstructure optical microscope was used. The chemical composition of bonding area and variation of alloy elements were studied with scanning electron microscope equipped with Energy dispersive spectroscopy (EDS).For investigation of mechanical properties of samples, shear strength and microhardnes testes were used. The results showed that in the 600°C and 60min isothermal solidification was completed whiles on the other samples, eutectic compounds were existed. With increasing of bonding temperature and time, diffusion affected zone of interfacial and base metal elements was increased, whiles the amount of intermetallic brittle compounds with increasing of these variations were decreased. Studding of phases that formed on bonding area show that most of these phases were enriched of Al and Cu, but intermetallic compounds between Mg and Si also were existed. Investigation of microhardness test results showed that with increasing of bonding temperature and time the hardness of bonding area were decreased that was because of decreasing of intermetallic compounds. Studding of shear strength showed that maximum strength was for the sample which bonded at 600°C for 60min which was because of exclusion of diffusion affected zone.