Creep age forming techniques have been widely used in aerospace industries. In this study, we investigated the effect of aging temperature (143 °C–163 °C) on the creep behavior of Al-Li-S4 aluminum alloy and their mechanical properties at room temperature. The mechanical properties were tested by tensile testing, and the microstructural evolution at different aging temperatures was examined by transmission electron microscopy. Results show that the creep strains and the room-temperature mechanical properties after creep aging increase with the aging temperature. As the aging temperature increases, the creep strain increases from 0.018% at 143 °C to 0.058% at 153 °C, and then to 0.094% at 163 °C. Within 25 h aging, the number of creep steps increases and the duration time of the same steps is shortened with the growth of aging temperatures. Therefore, the increase in aging temperatures accelerates the progress of the entire creep. Two main strengthening precipitates θ′ (Al₂Cu) and T₁ (Al₂CuLi) phases were characterized. This work indicates that the creep strain and mechanical properties of Al-Li-S4 alloys can be improved by controlling aging temperatures.

蠕变年龄形成技术已广泛用于航空航天工业。在这项研究中，我们研究了时效温度（143°C–163°C）对Al-Li-S4铝合金蠕变行为及其在室温下的力学性能的影响。通过拉伸测试来测试机械性能，并且通过透射电子显微镜检查在不同时效温度下的显微组织演变。结果表明，蠕变时效后的蠕变应变和室温力学性能均随时效温度的升高而增加。随着时效温度的升高，蠕变应变从143°C的0.018％增加到153°C的0.058％，然后在163°C达到0.094％。在时效25小时内，随着时效温度的升高，蠕变步骤数增加，并且相同步骤的持续时间缩短。因此，时效温度的升高加速了整个蠕变的进程。两个主要的强化析出物θ'（Al表征了₂ Cu）和T ₁（Al ₂ CuLi）相。这项工作表明，通过控制时效温度可以改善Al-Li-S4合金的蠕变应变和力学性能。