中文摘要：

在时效温度为175℃,时效时间为18 h时,开展不同应力水平（120~200 MPa）条件下的应力松弛时效与蠕变时效对比实验。建立应力松弛时效与蠕变时效强化模型,对强化模型进行验证与分析。研究结果表明：合金的屈服强度不仅受应力强化作用面积的影响,而且在时效初期阶段高应力作用对合金的屈服强度产生重要影响;在相同应力强化作用面积条件下,分别由应力松弛时效强化模型与蠕变时效强化模型计算的屈服强度增量差值与应力强化作用面积之间存在一定的线性关系,可以通过蠕变时效来预测应力松弛时效过程中合金强度的演变规律。

英文摘要：

The comparison experiment of stress relaxation aging and creep aging was carried out under the stress of 120-200 MPa at 175 ℃ aging for 18 h. The strength model of both stress relaxation aging and creep aging was established. The results show that the yield strength is affected not only by the reinforcement area of stress, but also by the high stress at the beginning of the aging stage through the test of mechanical properties. A linear relationship is found between the incremental difference of yield strength calculated based on the strength model of stress relaxation aging and creep aging under the condition of the same stress reinforcement area. So the evolution rule of strength during stress relaxation aging can be predicted by conducting the experiment of creep aging.