Asymmetric accumulative roll bonding of aluminum/copper composite sheets

Mehran Tamjidi Eskandar; Ali Parvizi; Davood Rahmatabadi; Ramin Hashemi

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Asymmetric accumulative roll bonding of aluminum/copper composite sheets

机译：铝/铜复合板的不对称累积辊粘合

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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.

机译：本研究首次进行了全面的实验研究，以研究不同辊直径比（R _（d））对由不对称累积辊粘合过程产生的Al / Cu复合材料的机械性能和塑性不稳定性的影响。为此目的，在三次通过中使用三种不同的R _（d）制备Al / Cu复合材料。然后，确定所有样品的粘合强度，机械性能，微观结构和断裂表面。结果表明，由于严重塑性变形过程的机制，与铝和铜相比，所有复合材料的机械性能都大幅增加。随着R _（d）增加，Al / Cu接口的粘合强度和硬度由于改善的塑性变形速率，表面膨胀和在两层边界处的材料挤出而增加。此外，由于菌株和应变硬化的不均匀分布，发现沿厚度的硬度是非常异构的。扫描电子显微镜（SEM）显微照片描绘了层厚度的减小，铜的塑料不稳定性的增加，以及作为R _（d）的层的改善的粘接强度。然而，在所有标本中，保持层状结构。骨折显微照片还揭示了骨折机制对于铝和铜层不同R _（d）的延展性。然而，随着R _（d）的增加，凹坑的数量和深度以及微孔减小。最后，该过程的非均匀应变分布导致微脉冲以不同的方向绘制。

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来源
《Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application》 |2021年第4期|842-852|共11页
作者
Mehran Tamjidi Eskandar; Ali Parvizi; Davood Rahmatabadi; Ramin Hashemi;
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作者单位

School of Mechanical Engineering University of Tehran;

School of Mechanical Engineering University of Tehran;

School of Mechanical Engineering University of Tehran;

School of Mechanical Engineering Iran University of Science and Technology;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
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关键词
Asymmetric accumulative roll bonding; severe plastic deformation; mechanical properties; bond strength; microstructure;

机译：不对称累积辊粘合;严重的塑性变形;机械性能;粘合强度;微观结构;

Asymmetric accumulative roll bonding of aluminum/copper composite sheets

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