Grain-boundary strengthening in nanocrystalline chromium and the Hall–Petch coefficient of body-centered cubic metals

Nanocrystalline Cr (nc-Cr) was synthesized by electrodeposition. Samples with various grain sizes (19–57nm) were prepared by annealing the as-deposited sample. Microstructures were examined using X-ray and electron microscopy, and the mechanical properties were evaluated using nanoindentation. The s...

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Bibliographic Details
Published in:Scripta materialia 2013-01, Vol.68 (2), p.118-121
Main Authors: Wu, D., Zhang, Junyan, Huang, J.C., Bei, H., Nieh, T.G.
Format: Article
Language:English
Subjects:
Grain boundaries
Hall–Petch effect
Nanocrystalline metal
Nanoindentation
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Summary:Nanocrystalline Cr (nc-Cr) was synthesized by electrodeposition. Samples with various grain sizes (19–57nm) were prepared by annealing the as-deposited sample. Microstructures were examined using X-ray and electron microscopy, and the mechanical properties were evaluated using nanoindentation. The strength of nc-Cr samples apparently obeyed the classical Hall–Petch relationship. It was found that hardening potency caused by grain refinement was generally higher in body-centered cubic metals than that in face-centered cubic and hexagonal close-packed metals. A possible explanation was offered.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2012.09.025