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Aluminum alloys are widely used in engineering structures due to light weight and corrosion resistance but aluminum has low yielding and flow strengths. Here we reported super-strong Al-30 vol%SiC composites with a flow strength of about 1.18 GPa up to a uniform strain of 16.0%. Micromechanical tests revealed a flow strength of 0.73 GPa associated with the nano-spaced SiC nanowires strengthening, and additional flow strength of 0.45 GPa associated with high-density stacking faults (SFs) that are rarely formed and stabilized in Al due to high stacking fault energy (SFE). More surprisingly, SFs possess excellent thermal stability up to 320 °C and can be regained by thermal cooling even after they are eliminated during annealing at 600 °C. Microscopy characterizations and theoretical analysis revealed that thermal mismatch induced high stress during cooling promotes the formation of SFs, and the segregation …