چكيده به لاتين
In recent years, layered composite have been attention of many researchers and different industries. Accumulative roll bonding (ARB) is one of the method for produce layered composite that compared to other composite manufacturing methods are more economically and have the ability to produce layered composite with different material. In the present study, Al/Cu/Mg layered composite was produced through ARB method at room temperature, without lubricant and via using laboratory rolling machine by applying 60% reduction in thickness. In this study, plane stress fracture toughness was investigated experimentally, by R curve method for initial aluminum, copper, magnesium samples and Al/Cu/Mg composite produced by ARB process. The results showed that the fracture toughness depends on both strength and ductility. Also, fracture toughness of produced layered composite reached 32.1, which increased 3.24, 2.18 and 2.73 times, respectively, compared to the initial samples of aluminum, copper and magnesium. In addition to investigations of the fracture toughness, mechanical properties and microstructure investigated. Results showed the value of tensile strength and microhardness for Al/Cu/Mg layered composite compared to initial samples increased. Value of tensile strength for Al/Cu/Mg layered composite received 220.3MPa that compared to initial Al 1050 and pure Cu and Mg AZ31B, 144%, 23% and 29% enhanced, respectively. Also microhardness calculated for each layers of composite individually and for Al Cu and Mg increased 136%, 84% and 41%, respectively. Results of SEM demonstrated that ductile fracture mechanism govern for Al and Cu layers but fracture surface of Mg layer is absolutely brittle fracture.
