An extended hardness limit in bulk nanoceramics

Mechanical strengthening by grain refinement is a method whereby a material’s strength and hardness can be increased by decreasing the average crystallite grain size. The empirical Hall–Petch relationship mathematically describes grain boundary strengthening and provides guidance for a straightforwa...

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Bibliographic Details
Published in:	Acta materialia 2014-05, Vol.69, p.9-16
Main Authors:	Wollmershauser, James A., Feigelson, Boris N., Gorzkowski, Edward P., Ellis, Chase T., Goswami, Ramasis, Qadri, Syed B., Tischler, Joseph G., Kub, Fritz J., Everett, Richard K.
Format:	Article
Language:	eng
Subjects:	Applied sciences Ceramics Exact sciences and technology Grain size Hall–Petch Hardness High-pressure sintering Inverse Metals. Metallurgy Nanoceramic Nanocrystalline ceramic Nanocrystals Nanostructure Powder metallurgy. Composite materials Production techniques Sintered metals and alloys. Pseudo alloys. Cermets Spinel Strengthening
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Summary:	Mechanical strengthening by grain refinement is a method whereby a material’s strength and hardness can be increased by decreasing the average crystallite grain size. The empirical Hall–Petch relationship mathematically describes grain boundary strengthening and provides guidance for a straightforward way to produce stronger materials. While the phenomenon has been widely explored in nanocrystalline metals, the difficulty associated with fabricating high-quality dense nanocrystalline ceramics has left unanswered the question of the validity and extent of the relationship in ceramics. Prior studies suggest the occurrence of an inverse Hall–Petch response in ceramics with grain sizes
ISSN:	1359-6454 1873-2453