Asymmetric accumulative roll bonding of aluminum/copper composite sheets

被引:2
作者
Eskandar, Mehran Tamjidi [1 ]
Parvizi, Ali [1 ]
Rahmatabadi, Davood [1 ]
Hashemi, Ramin [2 ]
机构
[1] Univ Tehran, Sch Mech Engn, Tehran, Iran
[2] Iran Univ Sci & Technol, Sch Mech Engn, Tehran, Iran
关键词
Asymmetric accumulative roll bonding; severe plastic deformation; mechanical properties; bond strength; microstructure;
D O I
10.1177/1464420720980482
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
For the first time in this study, a comprehensive experimental investigation was performed to investigate the effect of different roller diameter ratios (R-d) on mechanical properties and plastic instability of Al/Cu composite produced by the asymmetric accumulative roll bonding process. For this purpose, Al/Cu composites were produced using three different R-d in three passes. Then, bond strength, mechanical properties, microstructure, and fracture surface of all specimens were determined. The results showed that due to the mechanisms underlying the severe plastic deformation processes, all composites' mechanical properties sharply increased compared to aluminum and copper. As the R-d increases, the bond strength and hardness of the Al/Cu interface increase due to improved plastic deformation rate, surface expansion, and more extrusion of the material at the boundary of two layers. Besides, the hardness along the thickness was found to be very heterogeneous due to the uneven distribution of strain and strain hardening. Scanning Electron Microscopy (SEM) micrographs depicted a decrease in the layers' thickness, an increase in the plastic instability of the copper, and improved bonding strength of the layers as R-d rises. However, in all specimens, the layered structure was maintained. Fracture micrographs also revealed that the fracture mechanism is ductile for both aluminum and copper layers at different R-d. However, with increasing the R-d, the number and the depth of the dimples along with micro-pores decrease. Finally, the non-uniform strain distribution of the process caused the micro-dimples to be drawn in different directions.
引用
收藏
页码:842 / 852
页数:11
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