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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 k J/mol;施加130 MPa+16 k V/cm耦合外场时效后,S相激活能仅降低了38 k J/mol。
Differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and other analytical tools were used to investigate the DSC curve and microstructure of 2524 alloy after stress-electric field coupling aging. The results showed that the volume fraction of S phase in 2524 aluminum alloy increased and the rate of precipitation increased by 30% and the formation of S phase was activated after 25 ~ 130 MPa stress aging compared with that without field aging (190 ℃ / 5 h) Can reduce 55 kJ / mol. When 130 MPa + 16 kV / cm coupled field aging is applied, the S-phase activation energy decreases by only 38 kJ / mol.