(苏州有色金属加工研究院，苏州 215026)
摘 要: 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。
关键字: 6××× 系铝合金；热轧板退火温度；差示扫描量热法；β″相；析出动力学
（Suzhou Institute for Non-ferrous Metals Processing Technology, Suzhou 215026, China）
Abstract:Abstract: Differential scanning calorimetric (DSC) technique was used to study the influence of hot-roll annealing temperature on the precipitation kinetics of β″ phase in a 6××× alloy. The activation energy for the β″ formation in various hot-rolling temperature was calculated, and the samples were simulated paint-bake treated. The results show that with the increase of hot-roll annealing temperature, the activation energy for the β″ formation slightly decreases, indicating the formation of β″ becoming easier, and therefore the simulated paint-bake response increases.
Key words: 6××× series alloy; hot-roll annealing temperature; differential scanning calorimetric (DSC); β″ phase; precipitation kinetics
