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Two T6 (500°C × 3 h, water quenching and 210°C × 6 h, air cooling) samples of Al-13Si-5Cu-2Ni-1Mg alloy were furture heated to 350°C and 420°C, respectively for various times. The tensile strength of the alloy, measured at both room temperature and 350°C is observed to abnormally increase, especially for the samples that were heated to 420°C. Al 11 Cu 5 Mn 3  nanoparticles that form stably during these heating processes exhibit a higher volume fraction after the exposure to 420°C than that obtained by the exposure to 350°C. These nanoparticles were responsible for enhancing the alloy's tensile properties because of the precipitation strengthening effect of the second nano-phase.

Nanophase formation during the heat treatment of Al-13Si-5Cu-2Ni-1Mg alloy and the abnormal enhancement of its tensile properties