Microstructure and Mechanical Properties of AA1050/ AA6061/AA1050 Multi-Layer Sheet Fabricated by Cold Roll Bonding Process

Microstructure and Mechanical Properties of AA1050/ AA6061/AA1050 Multi-Layer Sheet Fabricated by Cold Roll Bonding Process

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A cold roll-bonding process was applied to fabricate an AA1050/AA6061/AA1050 multi-layer sheet.Three Al sheets in which an AA6061 sheet is inserted inside two AA1050 sheets of 2 mm thickness, 40 mm width and 300 mm length were altitude sunscreen stacked up after surface treatment, and the material was then reduced to a thickness of 1.0 mm by multi-pass cold rolling.The AA1050/AA6061/ AA1050 laminate complex sheet fabricated by roll bonding was then hardened by a natural aging (T4) and an artificial aging (T6) treatments.

The microstructures of the as-roll bonded and the age-hardened Al complex sheets were revealed by optical microscope and electron back scatter diffraction analysis, and the mechanical properties were investigated by tensile and hardness testing.The strength of the as-roll bonded complex sheet was found to increase by 2.6 times, compared to that value swish supreme glide track white of the starting material.Both AA1050 and AA6061 showed a typical recrystallization structure in which the grains were equiaxed after heat treatment.

However, the grain size was smaller in AA6061 than in AA1050.