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

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

研究成果: Article査読

82 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)2108-2111
ページ数4
ジャーナルNano Letters
7
7
DOI
出版ステータスPublished - 2007 7月 1

ASJC Scopus subject areas

  • バイオエンジニアリング
  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学
  • 機械工学

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