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Due to native deficiency of the interfacial mismatch between Al₂O₃ and Al-melt, as well as micron-Al₂O₃ segregation at matrix grain boundaries (GBs), achieving both high strength and fracture toughness has been the long-lasting challenge for Al-CuO composite fabricated by conventional casting. Herein, we report a novel manufacturing of Al-CuO composite via shift-speed ball-milling (SSBM) of Al-5 wt.% CuO powders and afterwards subjected to hot-pressing (HP) as well as heat treatment. Comprehensive characterization shows that in-situ generation of the two types of Al₂O₃ with intragranular distribution, including δ*-Al₂O₃ particles (~200 nm) and γ-Al₂O₃ whiskers (length of ~150 nm, thickness of ~20 nm), was governed by a diffusion-assisted nucleation-regime ascribing to the intense thermal effect of Al-CuO reaction. The size and spatial distribution of Al₂O₃ were emphasized to address their contribution to …