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Microstructural Origin of Superior Compressive Ductility of a Nanocrystalline Metal

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Abstract:

Ultra-large compressive plasticity at room temperature has recently been observed in electrodeposited nanocrystalline nickel (nc-Ni) under micro-scale compression (Pan, Kuwano, Fujita and Chen: Nano Lett. Vol. 7 (2007), p. 2108). With aid of a TEM sample preparation technique employing focused ion beam (FIB), TEM observations on deformed nc-Ni evidenced deformation-induced microstructural evolution of nc-Ni at a variety of strain levels: Whilst the deformation increases, substantial grain growth is uncovered in the nc-Ni. No apparent ex situ evidence of intragranular dislocation activities is found in the deformed sample. As thermal diffusion plays an insignificant role in the deformation in nc-Ni at room temperature (~0.17Tm), this premium plasticity is achieved in accommodation with the grain-boundary-mediated deformation, with assistance of extensive grain growth that is mainly driven by high stresses at steady plastic flow.

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Periodical:

Materials Science Forum (Volumes 633-634)

Pages:

73-84

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.633-634.73

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Online since:

November 2009

Authors:

Deng Pan, S. Kuwano, T. Fujita, M. W. Chen

Keywords:

Compressive Ductility, Deformation, Microstructure, Nanocrystalline Metals

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