Evolution of Internal Stress Field in Ni-Base Superalloy through Creep Deformation
Internal elastic strain, and its change accompanied with the raft formation during creep deformation in the Ni-based single crystal superalloy (TMS-26) have been investigated by X-ray diffractometry. The elastic strain caused by the lattice misfit between g and g' phases has markedly been changed by creep deformation especially in the directions perpendicular to the  tensile axis. The change in the elastic strain can be explained by the effect of creep dislocations stacked at g/g' interfaces. The evolution of the elastic stress field estimated from the elastic strain has explained well the transition from primary creep stage to the second one.
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
K. Tanaka et al., "Evolution of Internal Stress Field in Ni-Base Superalloy through Creep Deformation", Materials Science Forum, Vols. 475-479, pp. 619-622, 2005