Abstract
The present study investigates the kinetics of the widening of γ-channels in the single crystal superalloy CMSX-4 during high temperature and low stress creep. Shear creep specimens subjected to high resolution shear creep testing were investigated using scanning and transmission electron microscopy (SEM and TEM) in combination with quantitative image analysis. {011} -shear creep tests were performed at a shear stress τ = 50 MPa and a temperature of 1080 °C. For the macroscopic crystallographic shear system {011} it was found that γ'-rafts form in an angle of 45 ° to the macroscopic shear direction. The kinetics of γ-channel widening can be described by a parabolic rate law. Therefore it is concluded that the diffusion of atoms through the γ-channels of γ/γ'-microstructures is the rate controlling process for rafting.
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