Contribution of grain boundary related strain accommodation to deformation of ultrafine-grained palladium

Ultrafine-grained Pd specimens with a mean grain size of 130nm were compressed by 10% in a scanning electron microscope and the strain-induced change in orientations of grains was measured by in-situ electron-backscattering diffraction. A comparison of grain orientations before and after compression...

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Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 668; pp. 255 - 262
Main Authors Ivanisenko, Yu, Enikeev, N.A., Yang, K., Smoliakov, A., Soloviev, V.P., Fecht, H., Hahn, H.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 21.06.2016
Subjects
Accommodation
Deformation mechanisms
Dislocations
EBSD
Grain boundaries
Grains
Nanostructured materials
Orientation
Palladium
Plasticity
Scanning electron microscopy
Strain
Grain boundaries
Deformation mechanisms
Nanostructured materials
EBSD
Plasticity
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Summary:Ultrafine-grained Pd specimens with a mean grain size of 130nm were compressed by 10% in a scanning electron microscope and the strain-induced change in orientations of grains was measured by in-situ electron-backscattering diffraction. A comparison of grain orientations before and after compression straining revealed substantial grain rotations. The analysis of the results performed using polycrystal plasticity simulation showed that the variation of orientations with strain cannot be explained only by crystallographic dislocation slip. A large portion of strain is proved to be accommodated via cooperative non-crystallographic grain rotation.
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ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2016.05.036