Investigating the microstructure an‎d mechanical properties of the Al-Cu-Al(x) Cu(y) composite produced by combining explosive welding an‎d accumulative roll bonding (ARB) processes.

2/18/2027 12:00:00 AM

In this study, aluminum–copper laminated composites were fabricated using a single-step process (referring to laminated composites produced from explosively welded aluminum–copper metal couples under ambient temperature conditions) an‎d a two-step process (referring to laminated composites produced from explosively welded aluminum–copper metal couples followed by an annealing treatment). Subsequently, the resulting microstructural features an‎d mechanical properties were systematically investigated. Microstructural observations revealed that annealing during the two-step process led to chemical diffusion an‎d the formation of intermetallic compounds with AlCu an‎d Al₂Cu stoichiometries at the aluminum–copper interfaces. The formation of these intermetallic compounds in the two-step process during the initial cycles resulted in phenomena such as necking an‎d tearing of the layers. Moreover, strain hardening induced by the stresses generated during the final cycle (i.e., the fifth cycle) of the single-step process was identified as the primary factor responsible for intermetallic compound formation an‎d the occurrence of tearing within the laminated composite microstructure. Ultimately, increasing the number of cycles in both the single-step an‎d two-step processes led to a uniform distribution of aluminum an‎d copper layers throughout the laminated composite microstructure. Furthermore, the occurrence of recovery, recrystallization, an‎d grain growth during the two-step process resulted in a reduction in hardness compared to the single-step process. In addition, annealing during the two-step process produced a bimodal microstructure consisting of elongated an‎d recrystallized grains, which significantly contributed to the simultaneous improvement of strength an‎d elongation in the laminated composite. Fractographic analysis indicated that the fracture surface of the composite produced via the two-step process was predominantly ductile, whereas in the single-step process, increasing the number of cycles caused the fracture surface of the laminated composite to exhibit a tendency toward brittle fracture.

جوش انفجاري , نورد تجمعي , ريز ساختار , فرايندهاي مكانيكي

Explosive welding process , accumulative roll bonding process , mechanical properties , microstructure

AmirHossein Dorri

Dr. Seyed Hossein Razavi