Journal
ACTA MATERIALIA
Volume 55, Issue 17, Pages 5948-5958Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2007.07.020
Keywords
nanocrystalline materials; strain rate sensitivity; shear bands; pressure sensitivity
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The deformation behavior of nanocrystalline Ni-W alloys is evaluated by nanoindentation techniques for grain sizes of 3-150 nm, spanning both the range of classical Hall-Petch behavior as well as the regime where deviations from the Hall-Petch trend are observed. The breakdown in strength scaling, observed at a grain size of 10-20 nm, is accompanied by a marked transition to inhomogeneous, glass-like flow (i.e. shear banding) at the finest grain sizes approaching the amorphous limit. As a consequence of this mechanistic crossover, additional inflections arise in the mechanical properties; maxima are observed in both the rate and pressure dependence of deformation at approximately the same grain size as the onset of the Hall-Petch breakdown. These data experimentally connect the mechanical properties of nanocrystalline alloys to the well-known behavior of amorphous metals. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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