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Title: Deformation crossover : from nano- to mesoscale
Authors: Cheng, S.
Stoica, A. D.
Wang, X.-L.
Ren, Y.
Almer, J.
Horton, J. A.
Liu, C. T.
Clausen, B.
Brown, D. W.
Liaw, P. K.
Zuo, L.
Subjects: Grain size and shape
Issue Date: 17-Jul-2009
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
Type: Journal/Magazine Article
DOI: 10.1103/PhysRevLett.103.035502
ISSN: 0031-9007 (print)
1079-7114 (online)
Appears in Collections:ME Journal/Magazine Articles

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