title: Deformation crossover: from nano- to mesoscale.
abstract: In situ synchrotron and neutron diffraction were used to study deformation mechanisms in Ni over a broad range of grain sizes. The experimental data show that unlike in coarse-grained metals, where the deformation is dominated by dislocation slip, plastic deformation in nanocrystalline Ni is mediated by grain-boundary activities, as evidenced by the lack of intergranular strain and texture development. For ultrafine-grained Ni, although dislocation slip is an active deformation mechanism, deformation twinning also plays an important role, whose propensity increases with the grain size.
authors: Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors: S
authors: S
authors: Cheng
authors: A D
authors: AD
authors: Stoica
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authors: XL
authors: Wang
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authors: Ren
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authors: Almer
authors: J A
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authors: Horton
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authors: Liu
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authors: Clausen
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authors: Brown
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authors: Zuo