中文摘要：

通过对DD10单晶高温合金1100℃长时时效组织以及在1100℃/140MPa下持久试样断裂后不同部位的组织进行观察分析,研究应力对该合金组织稳定性的影响.结果表明：DD10单晶高温合金经1100℃/253h长时时效和1100℃/140MPa持久断裂后析出的TCP相均为富集Re,W,Cr和Mo元素的μ相.1100℃/140MPa持久条件下,应力的引入促进μ相的析出,且μ相的析出量随着应力的增大而增大,但应力未改变TCP相的析出种类和形貌.此外,应力促进γ＆#39;相的筏排化过程.

英文摘要：

The influence of stress on the microstructural stability of the DD10 single crystal superalloy was investigated using SEM after long-term aging at 1100℃ and stress rupture testing at 1100℃/140MPa. The results indicate that the TCP （topologically-close- packed） phases formed after aging at 1100℃ for 253h and stress-rupture at 1100℃/140MPa are μ phases enriched with Re, W, Cr and Mo. The stress promotes the formation of p~ phase, and the amount of μ phase increases with the stress increasing at 1100℃/ 140MPa. However, stress does not influence the type and morphology of TCP phase. In addition, the stress accelerates the rafting process of γ＇.