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采用差示扫描量热法(DSC)研究热轧板退火温度对6×××系铝合金时效过程中β″相析出动力学的影响。计算热轧板在不同退火温度下β″相形成激活能,并对不同热轧板退火温度的试样模拟烤漆后进行力学性能实验。结果表明:随着热轧板退火温度的提高,β″相的形成激活能略微降低,表明在时效过程中β″相更容易形成,合金的模拟烤漆强度因此得到提高。热轧板退火温度的提高,增大了基体中的Mg、Si原子的过饱和度,即增大了时效过程中β″相的形成驱动力,从而提高合金的模拟烤漆强度。
The effect of annealing temperature on the β “phase precipitation kinetics of 6 ××× aluminum alloy during aging was studied by differential scanning calorimetry (DSC). The formation of β” phase at different annealing temperatures was calculated Can, and different hot-rolled sheet annealing temperature of the sample simulated baking after mechanical properties experiments. The results show that the formation activation energy of β “phase slightly decreases with the increase of annealing temperature, which indicates that the β” phase is easier to form during the aging process and the simulated baking strength of the alloy is improved. The increase of annealing temperature of hot-rolled sheet increases the supersaturation of Mg and Si atoms in the matrix, which increases the driving force of formation of β "phase during aging, thereby increasing the simulated baking strength of the alloy.