中文摘要：

对Al-Li-S4合金进行了固溶、淬火及不同应力的高温蠕变时效试验,对蠕变后的试样进行了力学性能测试及TEM微观组织观察,研究了蠕变时效应力对该合金变形行为及微观组织与力学性能的影响。结果表明与无应力时效相比,材料的强度及蠕变速率都有明显的提升。通过对蠕变行为的分析,建立了Al-Li-S4合金的本构模型,进一步对试验数据回归,得到了蠕变本构方程中的材料常数。

英文摘要：

Solid solution, quenching and high temperature creep aging test under different stresses for Al-Li-S4 alloy were carried out. The mechanical properties of the samples aider the creep test were tested and the TEM microstructure were observed. Effects of creep aging stress on deformation behavior, microstructure and mechanical properties of the alloy were studied. The＇ results show that： the mechanical properties of the material and the creep rate are significantly improved compared with zero stress aging. Through the analysis of creep behavior, the constitutive model of Al-Li-S4 alloy was established. Further regressing experimental data, the material constants in the creep constitutive equation were obtained.