The effect of solid solution W additions on the mechanical properties of nanocrystalline Ni.

  • Schuh C
  • Nieh T
  • Iwasaki H
  • 1

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Abstract

Although pure metals with grain sizes below .apprx.10 nm are difficult to prep., alloying enables the realization of finer grain sizes, often down to the amorphous limit. In this work, the role of solid soln. addns. of .apprx.13 at.% W are considered with respect to the structure and mech. properties of electrodeposited Ni alloys with grain sizes below 10 nm. Structure of the nanocryst. alloys is analyzed by high-resoln. TEM, and related to the mech. properties assessed by instrumented nanoindentation and nano-scratch expts. The Ni-W alloys exhibit higher hardness and scratch resistance as compared to the finest pure nanocryst. Ni alloys, although the contribution of solid soln. strengthening from W is expected to be essentially negligible. The improved properties are therefore most likely due to the finer length scale available in multicomponent nanocryst. alloys, and suggest that alloying may suppress the breakdown of Hall-Petch strengthening to finer grain sizes. Finally, the present data are shown to smoothly bridge the hardness-grain size trend between nanocryst. Ni (grain size>10 nm) and amorphous Ni-based alloys. [on SciFinder (R)]

Author-supplied keywords

  • Electrodeposition
  • Hardness
  • Mechanical properties
  • Nanocrystalline metals Role: PEP (Physical, engine
  • Solid solutions (effect of solid soln. W addns. on
  • mech
  • nanocryst
  • nickel
  • property
  • solid
  • soln
  • tungsten

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Authors

  • C A Schuh

  • T G Nieh

  • H Iwasaki

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