Microstructure and mechanical properties of Al/Cu/Mg laminated composite sheets produced by the ARB proces
来源期刊：International Journal of Minerals Metallurgy and Materials2018年第5期
论文作者：Davood Rahmatabadi Moslem Tayyebi Ramin Hashemi Ghader Faraji
文章页码：564 - 572
摘 要：In the present study, an Al/Cu/Mg multi-layered composite was produced by accumulative roll bonding（ARB） through seven passes, and its microstructure and mechanical properties were evaluated. The microstructure investigations show that plastic instability occurred in both the copper and magnesium reinforcements in the primary sandwich. In addition, a composite with a perfectly uniform distribution of copper and magnesium reinforcing layers was produced during the last pass. By increasing the number of ARB cycles, the microhardness of the layers including aluminum, copper, and magnesium was significantly increased. The ultimate tensile strength of the sandwich was enhanced continually and reached a maximum value of 355.5 MPa. This strength value was about 3.2, 2, and 2.1 times higher than the initial strength values for the aluminum, copper, and magnesium sheets, respectively. Investigation of tensile fracture surfaces during the ARB process indicated that the fracture mechanism changed to shear ductile at the seventh pass.
Davood Rahmatabadi1，Moslem Tayyebi2，Ramin Hashemi1，Ghader Faraji3
1. School of Mechanical Engineering,Iran University of Science and Technology2. Department of Materials Engineering,Sahand University of Technology3. School of Mechanical Engineering,College of Engineering,University of Tehran
摘 要：In the present study, an Al/Cu/Mg multi-layered composite was produced by accumulative roll bonding（ARB） through seven passes, and its microstructure and mechanical properties were evaluated. The microstructure investigations show that plastic instability occurred in both the copper and magnesium reinforcements in the primary sandwich. In addition, a composite with a perfectly uniform distribution of copper and magnesium reinforcing layers was produced during the last pass. By increasing the number of ARB cycles, the microhardness of the layers including aluminum, copper, and magnesium was significantly increased. The ultimate tensile strength of the sandwich was enhanced continually and reached a maximum value of 355.5 MPa. This strength value was about 3.2, 2, and 2.1 times higher than the initial strength values for the aluminum, copper, and magnesium sheets, respectively. Investigation of tensile fracture surfaces during the ARB process indicated that the fracture mechanism changed to shear ductile at the seventh pass.
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