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Direct Evidence of a Deformation Mechanism Crossover in Nanocrystalline Nickel
Author(s) -
Shan Z.,
Mao S. X.
Publication year - 2005
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.200500034
Subject(s) - nanocrystalline material , materials science , grain boundary , nucleation , deformation mechanism , dislocation , plasticity , grain size , nickel , grain boundary strengthening , transmission electron microscopy , metallurgy , deformation (meteorology) , crossover , condensed matter physics , composite material , nanotechnology , microstructure , thermodynamics , physics , artificial intelligence , computer science
Evidence for deformation mechanism crossover, i.e. from dislocation nucleation and motion to grain boundary mediated plasticity, has been sought for many years, but direct experimental confirmation remains elusive. By employing in situ dynamics dark field transmission electron microscope investigation on nanocrystalline nickel films with an average grain size of about 10 nm, the authors show conclusive experimental evidence that grain boundary plasticity has begin to dominate the deformation of as deposited Ni. The physical mechanism that governs the observed phenomenon is discussed.