(蘇州有色金屬加工研究院，蘇州 215026)
摘 要: 采用差示掃描量熱法(DSC)研究熱軋板退火溫度對6××× 系鋁合金時效過程中β″相析出動力學的影響。計算熱軋板在不同退火溫度下β″相形成激活能，并對不同熱軋板退火溫度的試樣模擬烤漆后進行力學性能實驗。結(jié)果表明：隨著熱軋板退火溫度的提高，β″相的形成激活能略微降低，表明在時效過程中β″相更容易形成，合金的模擬烤漆強度因此得到提高。熱軋板退火溫度的提高，增大了基體中的Mg、Si原子的過飽和度，即增大了時效過程中β″相的形成驅(qū)動力，從而提高合金的模擬烤漆強度。
關鍵字: 6××× 系鋁合金；熱軋板退火溫度；差示掃描量熱法；β″相；析出動力學
（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
