Measurement of the energy of grain boundary geometrically-necessary dislocations in copper

Abstract

Measurements of the stored energy of cold work and recrystallization temperature of polycrystalline copper of a variety of grain sizes as a function of strain have been performed and it has been shown that: (1) The increase of stored energy with increasing strain falls into three distinct regimes as noted previously. (2) The total stored energy can be divided into two components: the stored energy from statistically-stored dislocations, which increases with increasing strain, and the stored energy from geometrically-necessary dislocation which increases sharply to a strain of {approximately}10%, at which point it saturates. (3) The saturation value of the stored energy from geometrically-necessary dislocations is inversely proportional to the grain size.