Plastic Deformation with Reversible Peak Broadening in Nanocrystalline Nickel

Plastic deformation in coarse-grained metals is governed by dislocation-mediated processes. These processes lead to the accumulation of a residual dislocation network, producing inhomogeneous strain and an irreversible broadening of the Bragg peaks in x-ray diffraction. We show that during plastic d...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2004-04, Vol.304 (5668), p.273-276
Main Authors: Budrovic, Zeljka, Van Swygenhoven, Helena, Derlet, Peter M., Van Petegem, Steven, Schmitt, Bernd
Format: Article
Language:English
Subjects:
Aerogels
Condensed matter: structure, mechanical and thermal properties
Crystal dislocations
Deformation
Diffraction
Exact sciences and technology
Furnaces
Grain size
Materials
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties of nanoscale materials
Nanocrystals
Nanotechnology
Nanotubes
Networks
Nickel
Nickel (Metal)
Numbers
Physics
Plastic deformation
Plasticity
Profiles
Properties
Residual stress
Wave diffraction
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Summary:Plastic deformation in coarse-grained metals is governed by dislocation-mediated processes. These processes lead to the accumulation of a residual dislocation network, producing inhomogeneous strain and an irreversible broadening of the Bragg peaks in x-ray diffraction. We show that during plastic deformation of electrodeposited nanocrystalline nickel, the peak broadening is reversible upon unloading; hence, the deformation process does not build up a residual dislocation network. The results were obtained during in situ peak profile analysis using the Swiss Light Source. This in situ technique, based on well-known peak profile analysis methods, can be used to address the relationship between microstructure and mechanical properties in nanostructured materials.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1095071