Microscale spatial distribution of dislocations and long range internal stresses in cold worked bcc Fe

Author(s): Erhard Schafler, Michael Zehetbauer, Tamas Ungar, Sigrid Bernstorff, H Amenitsch
Abstract: By X-ray Bragg profile analysis dislocation densities, arrangements and long range internal stresses in cold worked polycrystalline iron were determined using synchrotron radiation. Room temperature torsionally deformed samples with different deformations have been investigated by scanning measurements across single grains with a focal spot of less than 50?m, in order to get information on the characteristics of the deformation induced substructure. At small deformations including stage III, the dislocation densities and internal stresses are uniform within single grains while at higher deformations in stages IV & V, the dislocation density and internal stresses exhibit correlated fluctuations. These fluctuations in stage IV are identified as polarized tilt walls (PTW) formed from polarized dipole walls (PDW), in analogy to Cu. Œ 2000 Trans Tech Publications.
Organisation(s): Physics of Nanostructured Materials
External organisation(s): Elettra─Sincrotrone Trieste, Österreichische Akademie der Wissenschaften (ÖAW)
Journal: Key Engineering Materials
Volume: 177-180
Pages: 159-164
No. of pages: 6
ISSN: 1013-9826
DOI: https://doi.org/10.4028/www.scientific.net/KEM.177-180.159
Publication date: 2000
Peer reviewed: Yes
Austrian Fields of Science 2012: 1030 Physics, Astronomy
Portal url: https://ucrisportal.univie.ac.at/en/publications/3abf5e47-9784-4bca-9886-071928ae7d1f