The aluminum, of which the recovery was retarded by the addition of solute iron, was mechanically alloyed with C60 or graphite, hot pressed at 400°C or 500°C, extruded at 400°C, and then tensile tested at the room temperature. The added amount of C60 or graphite is 5% at the volume fraction, and the iron concentration is 0.5 mass%. In the case of C60, the tensile strength rises from 120 MN/m2 to 170 MN/m2, while the elongation decreases from 44% to 5%. When the graphite is added, the tensile strength hardly changes and the elongation decreases to 4%. The main cause of the increase in strength by addition of C60 is discussed to be the dispersion-hardening brought about by Al4C3 particles which were formed by decomposition of C60.