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Science 12 May 2006:
Vol. 312. no. 5775, pp. 889 - 892
DOI: 10.1126/science.1124141
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Reports

Formation and Subdivision of Deformation Structures During Plastic Deformation

Bo Jakobsen,1 Henning F. Poulsen,1* Ulrich Lienert,2 Jonathan Almer,2 Sarvjit D. Shastri,2 Henning O. Sørensen,1 Carsten Gundlach,1 Wolfgang Pantleon1

During plastic deformation of metals and alloys, dislocations arrange in ordered patterns. How and when these self-organization processes take place have remained elusive, because in situ observations have not been feasible. We present an x-ray diffraction method that provided data on the dynamics of individual, deeply embedded dislocation structures. During tensile deformation of pure copper, dislocation-free regions were identified. They showed an unexpected intermittent dynamics, for example, appearing and disappearing with proceeding deformation and even displaying transient splitting behavior. Insight into these processes is relevant for an understanding of the strength and work-hardening of deformed materials.

1 Center for Fundamental Research: Metal Structures in Four Dimensions, Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark.
2 Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.

* To whom correspondence should be addressed. E-mail: henning.friis.poulsen{at}risoe.dk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)