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Microstructure and texture of electrodeposited nanocrystalline nickel in the as-deposited state and after in-situ and ex-situ annealing

Cizek, P., Sankaran, A., Rauch, E. F. and Barnett, M. R. 2016, Microstructure and texture of electrodeposited nanocrystalline nickel in the as-deposited state and after in-situ and ex-situ annealing, Metallurgical and materials transactions a, vol. 47, no. 12, pp. 6655-6670, doi: 10.1007/s11661-016-3810-2.

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Title Microstructure and texture of electrodeposited nanocrystalline nickel in the as-deposited state and after in-situ and ex-situ annealing
Author(s) Cizek, P.
Sankaran, A.
Rauch, E. F.
Barnett, M. R.
Journal name Metallurgical and materials transactions a
Volume number 47
Issue number 12
Start page 6655
End page 6670
Total pages 16
Publisher Springer
Place of publication New York, N.Y.
Publication date 2016-12
ISSN 1073-5623
Keyword(s) Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
Summary The microstructure and texture characteristics of electrodeposited nanocrystalline nickel have been investigated in the present work. The material has been studied both in an as-received state and after in-situ and ex-situ annealing. The ASTAR automated crystal orientation mapping in a transmission electron microscope complemented by electron backscatter diffraction (EBSD) has been used in the investigation. The as-deposited material consisted of nanograins interspersed with coarser (sub)grain clusters, arranged in large mesoscale colonies and characterized by a dominant 〈001〉 fiber texture aligned with the deposition direction (DD). A large fraction of nanograin/cluster boundaries displayed a low-coincidence site lattice (low Σ) or twin character. The EBSD study confirmed the previously suggested presence of the “cobblestone”-type mesotexture, characterized by a local 〈001〉 fiber axis approximately perpendicular to the hemispherical growth surface of a mesoscale colony. The (sub)grain clusters contained low-angle boundaries and displayed large misorientation gradients; nevertheless, their orientations did not statistically differ from the surrounding nanograins. They did not serve as nuclei for the abnormal grain growth observed during annealing. The 〈001〉//DD to 〈111〉//DD fiber texture transition occurring during annealing did not result from the growth of pre-existing suitably oriented nuclei. Instead, copious twinning occurring along the migration front of the abnormally growing grains appeared to be primarily responsible for the above transition.
Language eng
DOI 10.1007/s11661-016-3810-2
Field of Research 0912 Materials Engineering
0306 Physical Chemistry (Incl. Structural)
0913 Mechanical Engineering
Socio Economic Objective 0 Not Applicable
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2016, The Minerals, Metals & Materials Society and ASM International
Persistent URL http://hdl.handle.net/10536/DRO/DU:30088994

Document type: Journal Article
Collection: Institute for Frontier Materials
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