(1. 常州大学 材料科学与工程学院，常州 213164；2. 中南大学 材料科学与工程学院，长沙 410083；
3. 常州大学 常州市先进金属材料重点实验室，常州 213164)
摘 要: 采用差示扫描量热法(DSC)研究了Al-Mg-Si和Al-Mg-Si-Cu铝合金的连续升温时效析出行为，并结合JMA方程分析Cu对该合金时效析出动力学的影响，计算出各种亚稳相析出动力学参数，进而得出各相析出的相关动力学表达式及TTT 曲线。结果表明：Cu显著地提高了Al-Mg-Si合金的时效硬化效果和速率，这与Cu的添加降低了析出激活能密切相关；Al-Mg-Si合金原子团簇、GP区、β〞和β＇的激活能分别为(67.3±1.5)、(96.9±3.5)、(106.6±3.1)和(158.9±3.9) kJ/mol；而Al-Mg-Si-Cu铝合金原子团簇、GP区、β〞、β＇、Q＇和Q相的激活能分别为(62.0±1.8)、(87.8±3.2)、(97.7±3.1)、(137.0±4.2)、(125.5±4.3)和(266.7±5.4) kJ/mol。
关键字: Al-Mg-Si-(Cu)铝合金；析出动力学；差热分析法；TTT曲线
Al-Mg-Si-(Cu) aluminum alloys during continuous heating
（1. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
3. Key Laboratory of Advanced Metallic Materials of Changzhou City,
Changzhou University, Changzhou 213164, China）
Abstract:During continuous heating, differential scanning calorimetry (DSC) and micro-hardness test were used to study precipitation behaviors of Al-Mg-Si and Al-Mg-Si-Cu alloys. The influence of Cu on the precipitation kinetics of Al-Mg-Si alloy was analyzed. The kinetic parameters of metastable phases in Al-Mg-Si-(Cu) alloy were obtained by using Avrami-Johnson-Mehl (AJM) equation. TTT curves and the kinetic expresses of metastable phases for Al-Mg-Si-(Cu) alloy were further gained. The results show that the addition of Cu enhances the age-hardening effect and precipitation kinetics, which may be due to the decrease of precipitation activation energy caused by the addition of Cu. The average activation energies associated with the precipitation of Si/Mg/Si-Mg clusters, GP-zones, β〞and β′ phases in Al-Mg-Si alloy are (67.3±1.5), (96.9±3.5), (106.6±3.1) and (158.9±3.9) kJ/mol, respectively. The average activation energies associated with the precipitation of Si/Mg/Si-Mg clusters, GP-zones, β′′ , β′ , Q′ and Q phases for Al-Mg-Si-Cu alloy are (62.0±1.8), (87.8±3.2), (97.7±3.1), (137.0±4.2), (125.5±4.3) and (266.7±5.4) kJ/mol, respectively.
Key words: Al-Mg-Si-(Cu) aluminum alloy; precipitation kinetics; differential scanning calorimetry (DSC); TTT curves
