Nano Archive

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

Pan, D. and Kuwano, S. and Fujita, T. and Chen, M. W. (2007) Ultra-large room-temperature compressive plasticity of a nanocrystalline metal. NANO LETTERS, 7 (7). pp. 2108-2111.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl071093m

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 similar to 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.

Item Type:Article
Uncontrolled Keywords:nanograin - nanocrystalline - plastic deformation - Ni
Subjects:Material Science > Nanostructured materials
ID Code:6224
Deposited By:IoN
Deposited On:07 Sep 2009 14:01
Last Modified:07 Sep 2009 14:01

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