Structure and mechanical properties of aluminum – aluminum nanoparticles composite produced by accumulative roll bonding

K.V. Ivanov, N.G. Rodkevich, S.V. Fortuna, T.A. Kalashnikova


A modified accumulative roll bonding (ARB) process was used to obtain ultrafine-grained aluminum matrix composite with aluminum nanoparticles produced by electric wire explosion and inserted between the bonded stripes. On the preliminary stage the pack consisting of two 1 mm thick stripes and nanopowder between them was rolled up to a significant strain level of 85% to obtain the well bonded thin stripe. On the first main stage (the first ARB cycle) the pack consisting of two ordinary stripes and a thin one with nanoparticles was rolled and cut in half. The sheet of Al-1%nAl composite was obtained as a result of 4 ARB cycles. For a comparison, commercial aluminum was processed under the same route without nanopowder insertion. Formation of an ultrafine-grained structure in both materials was found. Nanoparticles formed totally compacted layers between the bonded surfaces. The thickness of the layers decreased with the increase of the number of cycles, while the size of the structure elements remained unchanged. In the areas corresponding to the thin stripe inserted at final cycles of ARB, a decreased microhardness was observed owing to the less accumulated strain as compared to the ordinary stripes. The reasons for the weak effect of aluminum nanoparticles on the structure and tensile strength of the rolled products are discussed.

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