Anisotropy of transient high-temperature bending creep of single crystals

The orientation dependence of the transient high-temperature creep rate of NaCl and KCl single crystals under nonuniform stresses is experimentally studied. The anisotropy of high-temperature bending creep of single crystals is ascertained by analyzing the distribution of bending stresses, the number of possible dislocations providing deformation, the reduced shear stresses causing sliding of dislocations, and the dislocation structure of single crystals after creep. It is shown that hindered dislocation sliding in the easy sliding system activates a new slip system at a certain temperature.