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|Title:||Deformation crossover : from nano- to mesoscale|
Stoica, A. D.
Horton, J. A.
Liu, C. T.
Brown, D. W.
Liaw, P. K.
|Subjects:||Grain size and shape|
|Publisher:||American Physical Society|
|Source:||Physical review letters, 17 July 2009, v. 103, no. 3, 035502, p. 1-4.|
|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.|
|Rights:||Physical Review Letters © 2009 The American Physical Society. The Journal's web site is located at http://prl.aps.org/|
|Appears in Collections:||ME Journal/Magazine Articles|
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