▎ 摘　　要

Nanolaminated graphene (reduced graphene oxide)-aluminum composite irradiated with high energy helium ions at room temperature was shown to form deformation twins upon nanoindentation. This is in stark contrast to the dislocation-mediated plasticity in the as-fabricated composite, and the elongated helium bubbles that flowed with the soft Al matrix in the deformed composite irradiated at high temperature. A phenomenological model for helium-bubble-assisted twin formation was developed to rationalize the unique deformation microstructure observed in the composite irradiated at room temperature. The presence of deformation twinning mechanism in the irradiated composite may provide a potential measure to mitigate the irradiation-induced embrittlement. (C) 2020 Elsevier B.V. All rights reserved.