Journal article
“Observation” of dislocation motion in single crystal and polycrystalline aluminum during uniaxial deformation using photoemission technique
Materials science & engineering. A, Structural materials : properties, microstructure and processing, Vol.400(1-2), pp.476-480
2005
Handle:
https://hdl.handle.net/2376/100809
Abstract
We report measurements of photostimulated electron emission (PSE) from single-crystalline aluminum (99.995%) and high-purity polycrystalline aluminum (>99.9%) during uniaxial tensile deformation. Photoelectron intensities are sensitive to changes in surface morphology accompanying deformation, including slip line and slip band formation. In the single crystalline material, the PSE intensity increases linearly with strain. In the polycrystalline material, the PSE intensity increases exponentially with strain. In both materials, time-resolved PSE measurements show step-like increases in intensity consistent with the heterogeneous nucleation and growth of slip bands during tensile deformation. In this sense, we have “observed” dislocation motion by this technique. Slip bands on the surfaces of deformed samples were subsequently imaged by atomic-force microscopy (AFM). Photoelectron measurements can provide reliable, quantitative information for dislocation dynamics.
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Details
- Title
- “Observation” of dislocation motion in single crystal and polycrystalline aluminum during uniaxial deformation using photoemission technique
- Creators
- M Cai - Physics Department, Washington State University, PO Box 642814, Pullman, WA 99164-2814, USAL.E Levine - National Institute of Standards and Technology, 100 Bureau Dr., Gaithersburg, MD 20899-8553, USAS.C Langford - Physics Department, Washington State University, PO Box 642814, Pullman, WA 99164-2814, USAJ.T Dickinson - Physics Department, Washington State University, PO Box 642814, Pullman, WA 99164-2814, USA
- Publication Details
- Materials science & engineering. A, Structural materials : properties, microstructure and processing, Vol.400(1-2), pp.476-480
- Academic Unit
- Physics and Astronomy, Department of
- Publisher
- Elsevier B.V
- Identifiers
- 99900546686901842
- Language
- English
- Resource Type
- Journal article