TY - JOUR

T1 - Local lattice parameter measurements in cyclically deformed copper by convergent-beam electron diffraction

AU - Maier, H. J.

AU - Renner, H.

AU - Mughrabi, H.

N1 - Funding Information: The authors would like to thank Dr. R.R. Keller for many helpful discussions and G. Hoffmann for help in the experimental work. They are grateful to Outokumpu Finland for supplying the copper free of charge. This study was supported by Stiftung Volkswagenwerk and Deutsche Forschungsgemeinschaft.

PY - 1993/6

Y1 - 1993/6

N2 - Convergent-beam electron diffraction was used to characterize local lattice distortions associated with a heterogeneous dislocation arrangement in cyclically deformed polycrystalline copper. The results indicated the presence of a distorted lattice within the interior of the dislocation cells formed during cyclic deformation. The lattice distortion exhibited a dependence on external deformation conditions. Local lattice parameters were evaluated using computer-simulated patterns based on a kinematical approximation. From these measurements local strains and stresses are estimated. The lattice distortions measured are interpreted in terms of a model predicting substantial long-range internal stresses arising from glide dislocations of opposite sign accumulated on either side of the dislocation cell walls at the interfaces between the walls and the cell interiors.

AB - Convergent-beam electron diffraction was used to characterize local lattice distortions associated with a heterogeneous dislocation arrangement in cyclically deformed polycrystalline copper. The results indicated the presence of a distorted lattice within the interior of the dislocation cells formed during cyclic deformation. The lattice distortion exhibited a dependence on external deformation conditions. Local lattice parameters were evaluated using computer-simulated patterns based on a kinematical approximation. From these measurements local strains and stresses are estimated. The lattice distortions measured are interpreted in terms of a model predicting substantial long-range internal stresses arising from glide dislocations of opposite sign accumulated on either side of the dislocation cell walls at the interfaces between the walls and the cell interiors.

UR - http://www.scopus.com/inward/record.url?scp=0027620820&partnerID=8YFLogxK

U2 - 10.1016/0304-3991(93)90142-K

DO - 10.1016/0304-3991(93)90142-K

M3 - Article

AN - SCOPUS:0027620820

VL - 51

SP - 136

EP - 145

JO - ULTRAMICROSCOPY

JF - ULTRAMICROSCOPY

SN - 0304-3991

IS - 1-4

ER -