A microdiffraction method for the characterization of partial disclinations in plastically deformed metals by TEM

The disclination concept can be used to describe rotational substructures d eveloping under large-strain deformation of crystalline metals. The paper p resents a TEM microdiffraction method using local misorientation measuremen ts which allows the identification of disclinations. Copper single as well as polycrystals rolled down to 50% and 70% thickness reduction at room temp erature were investigated and partial disclinations were found in triple ju nctions of cell-block boundaries. The power of the partial disclinations li es in the range of 1.5 degrees to 2 degrees, in agreement with theoretical expectations.