The effect of heat treatment and crystallographic orientation on creep behavior of aluminized Ni-basesingle crystal superalloy CM186LC has been investigated in the present study. The aluminizedsuperalloy has a better creep rupture life after HT2 rather than after HT1 which is indicated by thereduction of the cuboidal precipitates size. The coating treatment resulted in a significant decrease increep rupture lives for all specimens. Generally, the specimens with (001) side-surface had a longercreep rupture life than the specimens with (011) side-surface, which means the results were anisotropicwith respect to the secondary orientation which is normal to the primary orientation. The anisotropiccreep behavior was affected by the microstructural change and the different arrangement of{111} slip systems. First, the microstructural change after creep rupture test which is designatedby the formation of TCP phase with a preferential orientation and SDZ. Second, the differentarrangement of {111} slip systems between the two side-surface specimens where the operationof {111} slip system would be more activated in (011) side-surface specimen than that in (001)side-surface specimen.
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