Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3000655
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- U.S. Army Research Office [DAAD19-03-1-0235]
- Institute for Soldier Nanotechnologies at MIT
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The breakdown of Hall-Petch strength scaling is investigated in nanocrystalline Ni-W alloys at high strain rates, using dynamic hardness testing at grain sizes ranging from 3 to 150 nm. Whereas quasistatic tests show a strength plateau below about 15 nm, high-rate tests (indentation strain rate of similar to 10(3) s(-1)) exhibit a pronounced strength peak and a regime of inverse Hall-Petch weakening. This effect is shown to be the result of a grain size-dependent rate sensitivity that exhibits a maximum at a grain size near 10-20 nm. High strain rates are also shown to promote shear banding at nanocrystalline grain sizes. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3000655]
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