Formation and Subdivision of Deformation Structures During Plastic Deformation
Abstract
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.
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The sample preparation was performed by G. Christiansen, and the EM studies were performed by Q. Xing. This work was supported by the Danish National Research Foundation and the Danish Natural Science Research Council. Use of the Advanced Photon Source was supported by the U.S. Department of Energy, Basic Energy Sciences, Office of Science, under contract no. W-31-109-Eng-38.
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Science
Volume 312 | Issue 5775
12 May 2006
12 May 2006
Copyright
American Association for the Advancement of Science.
Submission history
Received: 21 December 2005
Accepted: 16 March 2006
Published in print: 12 May 2006
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