The dislocation structures which formed during the pure shear creep deformation of super-alloy monocrystals at 1025C, under a shear stress of 85MPa, were analyzed by using transmission electron microscopy. Two macroscopic crystallographic shear systems were studied: {111}<110> and {100}<010>. At the minimum creep rate, the former system deformed some 10 times faster than did the latter system. This difference could not be explained on the basis of an external resolved shear stress argument alone. Shear creep deformation was always associated with multiple slip, and the nucleation of dislocations was not difficult. A detailed study of dislocation networks around ’ particles emphasized the importance of <110>{111} glide and climb processes in the formation of the networks.

C.Mayr, G.Eggeler, A.Dlouhy: Materials Science and Engineering A, 1996, 207[1], 51-63