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

Journal Article · Mon Dec 31 23:00:00 EST 2012 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2012.09.025· OSTI ID:1059342

Wu, Dong ^[1]; Junyan, Zhang ^[2]; Huang, J C ^[3]; Bei, Hongbin ^[4]; Nieh, Tai-Gang ^[4]

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1. University of Tennessee, Knoxville (UTK)
2. Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences
3. National Sun Yat-Sen University, Taiwan
4. ORNL

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

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1059342
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 2 Vol. 68; ISSN 1359-6462
• Country of Publication: United States
• Language: English