Abstract
Influence of aging treatment on mechanical properties was investigated in the CNT/Al–Cu–Mg rolled composites. The tensile strength of composites was strongly dependent on the aging annealing treatment, and stronger aging effect was observed in the composites compared with matrix alloy. The ultimate tensile strength was highest in the CNT/Al–Cu–Mg composites with peak-aging treatment, however, it sharply decreased when samples were over-aged. In addition to the load transfer and grain refinement, CNTs addition introduced strong back stress, and the aging nanoprecipitation strengthening promoted the strain hardening capability, which both significantly improved the ultimate tensile strength of composites.
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