The high-temperature creep behavior of single crystal nickel-base superalloys with, ,  and  orientations were studied under different experimental conditions. Details of the dynamic characteristics of these alloys were discussed in part I. This paper analyzes the microstructure
evolution of the three different orientation superalloys during tensile creep. Results show that after heat treatment, the microstructure of the three different orientation superalloys consists of the cuboidal phase embedded coherently in the matrix channels, and aligned regularly along 100
orientation. During high-temperature tensile creep, the phase is transformed into rafted structure. After creep fracture, as the distance from the fracture decreases, the deformation extent of the specimen increases, and the thickness of the rafted phases and the twist extent also increases.
The effect of the rafting orientation of the phase on the creep resistance of superalloys is also analyzed.
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