应力/电场耦合作用对2524铝合金时效动力学影响

Effect of Stress Coupled with Electric Field on Aging Dynamics of

摘要:

采用差热分析仪（DSC）、透射电子显微镜（TEM）等分析手段，研究应力/电场耦合时效后2524合金的DSC的曲线特征和微观组织。结果表明：与无外场时效（190 ℃/5 h）样品相比，施加25~130 MPa应力时效后，2524铝合金中S相析出体积分数升高，析出速率提高30%，S相的形成激活能降低55 kJ/mol；施加130 MPa+16 kV/cm耦合外场时效后，S相激活能仅降低了38 kJ/mol

Abstract:

The DSC curve characteristic and microstructure of 2524 aluminum alloy after stress coupled with electric field aging were investigated using Differential Scanning Calorimetry (DSC) and transmission electron microscopy (TEM), respectively. The results show that comparing to the alloy after aging at 190 oC/5 h without either external stress or electric field, the volume fraction of precipitated S phase increases in the sample after 25~130 MPa aging, the precipitation rate is increased by 30%, and the activation energy of S phase formation is decreased by 55 kJ/mol, while that of the alloy after aging under 130 MPa coupled with 16 kV/cm is decreased by only 38 kJ/mol