摘要 : The influences of natural aging and pre-straining on the age-hardening response of AA6022 (Al-0.6 Mg-1.0Si) has been investigated in this study. The precipitation behaviors of samples of the alloy were analyzed using differential ... 展开 The influences of natural aging and pre-straining on the age-hardening response of AA6022 (Al-0.6 Mg-1.0Si) has been investigated in this study. The precipitation behaviors of samples of the alloy were analyzed using differential scanning calorimetry (DSC), as well as by measuring the electrical conductivity, and confirmed by microstructure observation using transmission electron microscopy (TEM). Tensile tests and microhardness measurements were performed to determine the mechanical properties of the samples. With an increase in the natural aging time at room temperature (RT), more GP zones (1) are formed, which leads to a lower peak microhardness in artificially aged specimens. The initial decrease in the microhardness of the naturally aged sample during artificial aging could be attributed to the reversion of GP zones (1) that formed during natural aging. Pre-straining has a marked influence on the subsequent precipitation process of the AA6022, and indicates that suitable pre-straining can significantly reduce the detrimental effects of natural aging on the artificial aging kinetics. 收起