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Direct Bonding of Aluminum–Copper Metals through High‐Pressure Torsion Processing

High‐pressure torsion (HPT) is used to investigate the formation of a new metal system by the direct bonding of separate disks of Al and Cu by processing at room temperature under a compressive pressure of 6.0 GPa and with increasing numbers of HPT turns up to 60. A detailed examination of the micro...

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Bibliographic Details
Published in:Advanced engineering materials 2018-11, Vol.20 (11), p.n/a
Main Authors: Han, Jae‐Kyung, Han, Dae Kuen, Liang, Guang Yuan, Jang, Jae‐Il, Langdon, Terence G., Kawasaki, Megumi
Format: Article
Language:English
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Summary:High‐pressure torsion (HPT) is used to investigate the formation of a new metal system by the direct bonding of separate disks of Al and Cu by processing at room temperature under a compressive pressure of 6.0 GPa and with increasing numbers of HPT turns up to 60. A detailed examination of the microstructure and a phase analysis reveal the presence of three intermetallic compounds, Al2Cu, AlCu, and Al4Cu9, in the nanostructured Al matrix with a grain size of ≈30 nm. Processing by HPT leads to the formation of a metal–matrix nanocomposite with extreme hardness near the edge of the Al–Cu disks after 60 HPT turns. Experiments show that the estimated wear rates exhibit an improvement in wear resistance while maintaining low wear rates for high applied loads up to ≈40–50 N under dry sliding conditions. The results confirm that there is a significant potential for using HPT processing in the joining and bonding of dissimilar metals at room temperature and in the expeditious fabrication of a wide range of new metal systems having enhanced mechanical and functional properties. This report demonstrates the application of the high‐pressure torsion (HPT) technique for synthesizing a hybrid Al–Cu system by the direct bonding of separate Al and Cu disks at room temperature. As a consequence of severe deformation by HPT, the formation of intermetallic compounds is observed, thereby demonstrating the synthesis of an intermetallic‐based Al metal matrix nanocomposite in the alloy system.
ISSN:1438-1656
1527-2648
DOI:10.1002/adem.201800642