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The creep behavior of the third-generation single crystal superalloy DD9 at 1100 ℃/137 MPa is investigated using high-throughput scanning electron microscopy（SEM） and transmission electron microscopy（TEM）. The results show that the average creep rupture life of the alloy under this condition is 260 h. During the creep process，the γ' strengthening phase exhibits a gradual evolution from an initial cuboidal shape to directional coarsening， rafting， and eventually to local derafting at the later stage of creep. The composition difference between the dendrite core and the interdendritic regions is an important factor affecting the microstructural evolution of the DD9 alloy. The dislocation evolution during creep is characterized by initial dislocation motion mainly within the γ matrix channels， the formation of dense dislocation networks at the γ/γ' interfaces during secondary creep， the shearing of the γ' strengthening phase by dislocation pairs during tertiary creep， and a further increase in the number of dislocations shearing into the γ' phase at the fracture stage.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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