The thesis falls in three parts, focusing on different aspects of plastic deformation of metals.
Part I investigates the dislocation structures induced by hot deformation and compares these with the structures after cold deformation. In particular, it is shown that the dislocation structures in the investigated hot deformed samples (lnZ= 27.5 to 32) in general are cell block structures, and that the alignment of the cell block boundaries at low strain depends on the grain orientation, often in the same manner as in cold deformation.
Part II investigates the energy stored in the dislocation structure after cold deformation by calorimetry and by analysis of the dislocation structure. The stored energy measured by calorimetry is found to be larger than that determined from the dislocation structure by a factor between 1.9 and 2.7, and this factor decreases with the plastic strain.
Part III aimed at investigation of localized deformation in the form of Lüders bands by in-situ measurements using three-dimensional X-ray diffraction. This part concluded that modifications to the experimental setup is needed to obtain reliable data.
|Place of Publication||Roskilde|
|Publisher||Risø National Laboratory|
|Number of pages||299|
|Publication status||Published - 2008|