alexa A maximum in the strength of nanocrystalline copper.
Materials Science

Materials Science

Journal of Powder Metallurgy & Mining

Author(s): Schitz J, Jacobsen KW

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Abstract We used molecular dynamics simulations with system sizes up to 100 million atoms to simulate plastic deformation of nanocrystalline copper. By varying the grain size between 5 and 50 nanometers, we show that the flow stress and thus the strength exhibit a maximum at a grain size of 10 to 15 nanometers. This maximum is because of a shift in the microscopic deformation mechanism from dislocation-mediated plasticity in the coarse-grained material to grain boundary sliding in the nanocrystalline region. The simulations allow us to observe the mechanisms behind the grain-size dependence of the strength of polycrystalline metals. This article was published in Science and referenced in Journal of Powder Metallurgy & Mining

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