Deformation crossover: From Nano- to mesoscale

S. Cheng, A. D. Stoica, X. L. Wang, Y. Ren, J. Almer, J. A. Horton, C. T. Liu, B. Clausen, D. W. Brown, P. K. Liaw, L. Zuo

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

61 Citations (Scopus)

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. © 2009 The American Physical Society.
Original languageEnglish
Article number35502
JournalPhysical Review Letters
Volume103
Issue number3
Online published17 Jul 2009
DOIs
Publication statusPublished - 17 Jul 2009
Externally publishedYes

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