TY - JOUR
T1 - Deformation crossover
T2 - From Nano- to mesoscale
AU - Cheng, S.
AU - Stoica, A. D.
AU - Wang, X. L.
AU - Ren, Y.
AU - Almer, J.
AU - Horton, J. A.
AU - Liu, C. T.
AU - Clausen, B.
AU - Brown, D. W.
AU - Liaw, P. K.
AU - Zuo, L.
PY - 2009/7/17
Y1 - 2009/7/17
N2 - 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. © 2009 The American Physical Society.
AB - 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. © 2009 The American Physical Society.
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U2 - 10.1103/PhysRevLett.103.035502
DO - 10.1103/PhysRevLett.103.035502
M3 - RGC 21 - Publication in refereed journal
SN - 0031-9007
VL - 103
JO - Physical Review Letters
JF - Physical Review Letters
IS - 3
M1 - 35502
ER -