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Cyclic Cantilever Bending of Copper Nanowhiskers
Author(s) -
Schopf Carola,
Schamel Matthias,
Strunk Horst P.,
Richter Gunther
Publication year - 2012
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.201200036
Subject(s) - whiskers , materials science , whisker , cantilever , nucleation , composite material , bending , dislocation , yield (engineering) , copper , stress (linguistics) , shear (geology) , deformation (meteorology) , shear stress , metallurgy , linguistics , philosophy , chemistry , organic chemistry
A cyclic bending test with cantilever geometry is developed for probing local mechanical properties of single crystalline Cu nanowhiskers (NWs). A lower limit for the yield stress for such whiskers is derived at ≈5 GPa. Since all NWs exhibit the axis parallel to the 〈1 1 0〉 crystallographic direction, the resolved shear stress can be calculated. The values of ≈2 GPa lie close to the theoretical strength limit and predict partial dislocation nucleation as the governing mechanism at the onset of plastic deformation. The yield stress is practically independent of the whisker diameter.