Internal stress and dislocation structure of aluminum in high-temperature creep

Abstract

Abstract The dislocation structure formed in high-temperature creep of aluminum has been investigated in the transmission electron microscope. The effect of applied stress and temperature on the quantitative characteristics—dislocation density in sub-grains, subgrain size and misorientation—has been discussed. The correlation of the steady-state substructure characteristics with the macroscopic mean internal stress shows the main contribution of the internal stress field of dislocations in subgrains.