An analytical approach for necking and fracture of hard layer during accumulative roll bonding (ARB) of metallic multilayer

“…This results from the stresses between both bonded phases leading to the compression of the soft phase (Al 6061) and the tension of the hard phase (IF steel) hence the necking and the fragmentation of this last one along the rolling direction (see ref. for a full study of this phenomenon). These observations and the yield stresses’ evolution are in coherence with previous work on Al/Fe composites elaborated in ARB .…”

Section: Discussionmentioning

confidence: 99%

Magnetic Shielding at Low Frequencies: Application for an Aluminum/Steel Composite Elaborated by Accumulative Roll Bonding

et al. 2019

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An IF steel/Al6061 composite elaborated by Accumulative Roll Bonding at room temperature is proposed for shielding effectiveness applications. The obtained composite is lighter than the copper and the steel with a density of 3-4.5. In the earlier rollings, a multilayered composite is developed which is in favor of strength but not of shielding. On the contrary, after 3 roll bondings, fragments of IF steel appear in the Al6061 matrix and drastically reduce strength but improve shielding. A finite element simulation of the shielding effectiveness is performed and

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“…A necking and fracturing of the Cu phase when bonding with the Al phase was often observed under simple severe shear when processing by accumulative roll bonding (ARB) due to the differences in the stacking fault energies of Al and Cu which produces a large difference in the strain hardening rates of these two phases. Thus, it is anticipated that a unique two‐phase turbulent flow will occur in the present study, in addition to necking and fracturing of the Cu in the Al matrix, because of the complex severe shearing under the torsional and compressional straining during HPT processing.…”

Section: Methodsmentioning

confidence: 99%

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

Han

Liang

et al. 2018

Adv Eng Mater

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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, Al 2 Cu, AlCu, and Al 4 Cu 9 , 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.

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An analytical approach for necking and fracture of hard layer during accumulative roll bonding (ARB) of metallic multilayer

Cited by 85 publications

References 40 publications

High strength and thermal stability of bulk Cu/Ta nanolamellar multilayers fabricated by cross accumulative roll bonding

High strength and thermal stability of bulk Cu/Ta nanolamellar multilayers fabricated by cross accumulative roll bonding

Magnetic Shielding at Low Frequencies: Application for an Aluminum/Steel Composite Elaborated by Accumulative Roll Bonding

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

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