Letter abstract
Nature Materials 5, 619 - 622 (2006)
doi:10.1038/nmat1698
Subject Categories: Metals and alloys | Characterisation and analytical techniques | Mechanical properties
X-ray microbeam measurements of individual dislocation cell elastic strains in deformed single-crystal copper
Lyle E. Levine1, Bennett C. Larson2, Wenge Yang3, Michael E. Kassner4, Jonathan Z. Tischler2, Michael A. Delos-Reyes4, Richard J. Fields1 and Wenjun Liu5
The distribution of elastic strains (and thus stresses) at the submicrometre length scale within deformed metal single crystals has remarkably broad implications for our understanding of important physical phenomena. These include the evolution of the complex dislocation structures that govern mechanical behaviour within individual grains1, 2, 3, the transport of dislocations through such structures4, 5, 6, changes in mechanical properties that occur during reverse loading7, 8, 9 (for example, sheet-metal forming and fatigue), and the analyses of diffraction line profiles for microstructural studies of these phenomena10, 11, 12, 13, 14, 15. We present the first direct, spatially resolved measurements of the elastic strains within individual dislocation cells in copper single crystals deformed in tension and compression along 
001
axes. Broad distributions of elastic strains are found, with important implications for theories of dislocation structure evolution3, 16, 17, 18, 19, 20, dislocation transport4, 5, 6, and the extraction of dislocation parameters from X-ray line profiles10, 11, 12, 13, 14, 15, 21, 22, 23, 24.
- Materials Science & Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8553, USA
- Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- HPCAT/Carnegie Institution of Washington, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, California 90089, USA
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439-4800, USA
Correspondence to: Lyle E. Levine1 e-mail: Lyle.Levine@nist.gov
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