Anomalies in Hall-Petch strengthening for nanocrystalline Au–Cu alloys below 10nm grain size
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The mechanical behavior of an electrodeposited nanocrystalline alloy is assessed with regards to the experimentally measured strain-rate sensitivity. Foils are characterized with grain sizes as small as 3. nm, a nano-scale regime that has previously gone without detailed experimental examination. It is found from micro-scratch measurements that hardness, hence strength, approaches ideal values as the grain size decreases to 7. nm. Below 7. nm, softening in strength and departure from Hall-Petch behavior is related to an increase in the activation volume for deformation as grain size decreases further. © 2010 Elsevier B.V.
author list (cited authors)
Jankowski, A. F., & Nyakiti, L. O.