Ultra-large room-temperature compressive plasticity of a nanocrystalline metal

D. Pan, S. Kuwano, Takeshi Fujita, Mingwei Chen

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

We report ultra-large room-temperature plasticity of nanocrystalline Ni subjected to uniaxial compression. Up to 200% true plastic strain is achieved with a steady flow stress of ∼2 GPa at strain rates ranging from 10 -3 to 10-1 s-1. The low temperature, high strain rate, and high flow stress demonstrate that the observed ultra-large plasticity in nanocrystalline Ni is intrinsically dissimilar to that in traditional superplastic materials deformed at high temperatures. Microstructural observations reveal significant nanograin growth accompanied with the ultra-large plastic deformation, indicating the ultra-large plasticity in nanocrystalline Ni at room temperature is mainly performed by a grain-boundary-mediated process that is driven by high stresses rather than by thermal diffusion.

Original languageEnglish
Pages (from-to)2108-2111
Number of pages4
JournalNano Letters
Volume7
Issue number7
DOIs
Publication statusPublished - 2007 Jul 1

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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