Microstructure and texture evolution during accumulative roll bonding of aluminium alloys AA2219/AA5086 composite laminates
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Accumulative roll bonding of two aluminium alloys, AA2219 and AA5086 was carried out up to 8 passes. During the course of ARB, the deformation inhomogeneity between the two alloy layers results in interfacial instability after the 4th pass, necking of the AA5086 layers after the 6th pass and fracture along the necked regions after the 7th and 8th pass. The EBSD analysis shows deformation bands along the interfaces after 8 passes of ARB. The ARB-processed materials predominantly show characteristic deformation texture components. The weak texture after the 2nd pass results from the combination of a weakly-textured starting AA2219 layer and a strongly-textured starting AA5086 layer. A strong deformation texture forms due to the high imposed strain after a higher number of ARB passes. Subgrain formation and related shear banding induces copper/S components in the case of the small elongated grains, while planar slip leads to the formation of brass component in the large elongated grains.
KeywordsTexture Component Texture Evolution Accumulative Roll Bonding High Angle Boundary Alloy Layer
The authors would like to thank The Boeing Company, USA, for providing the financial support and the required material for the present study. The Institute Nano-science Initiative (INI) and Institute X-ray Facility at Indian Institute of Science, Bangalore, India are also acknowledged for providing the research facilities related to this study. We are grateful to Dr. K. K. Sankaran of The Boeing Company for his help and support during all stages of this study. The assistance offered by Mr. Subhasis Sinha, Mr. Arun Dinesh P. and Mr. Suhas Karanth during various experiments is also acknowledged.
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