Paper Title:
Microstructural Origin of Superior Compressive Ductility of a Nanocrystalline Metal
  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.

  Info
Periodical
Materials Science Forum (Volumes 633-634)
Edited by
Yonghao Zhao and Xiaozhou Liao
Pages
73-84
DOI
10.4028/www.scientific.net/MSF.633-634.73
Citation
D. Pan, S. Kuwano, T. Fujita, M. W. Chen, "Microstructural Origin of Superior Compressive Ductility of a Nanocrystalline Metal", Materials Science Forum, Vols. 633-634, pp. 73-84, 2010
Online since
November 2009
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Price
$32.00
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