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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