بررسي پارامترهاي مؤثر شكل دهي و ارايه مدل رياضي براي جوش پذيري در كامپوزيت هاي لايه اي آلومينيم - مس حين فرآيند ECAE

An investigation on the effective parameters and mathematical model for cold welding of Aluminum-Copper laminate composites during ECAE process

In this research, the aluminum and copper strips were cold welded using the equal channel angular extrusion(ECAE)process. The bonding strength was measured with shearing test. According to the results, the bonding strength was affected by the inner die and outer curved corner angles, thickness ratio and the stacking condition of the strips. Indeed, the welding threshold deformation increased by increasing the die profile angles. Whereas, the bonding strength improved with reduction in copper to aluminum thickness ratio and inserting the harder copper strip close to die angle side. In order to evaluate the morphological nature and bonding mechanisms, the fractured peeled surfaces were studied by scanning electron microscope. Also, a mathematical model was proposed to investigate the weld interface conditions with regard to the fracture mechanics theorems.