TITLE

Deformation twinning during nanoindentation of nanocrystalline Ta

AUTHOR(S)
Wang, Y. M.; Hodge, A. M.; Biener, J.; Hamza, A. V.; Barnes, D. E.; Liu, Kai; Nieh, T. G.
PUB. DATE
March 2005
SOURCE
Applied Physics Letters;3/7/2005, Vol. 86 Issue 10, p101915
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The deformation mechanism of body-centered cubic (bcc) nanocrystalline tantalum with grain sizes of 10–30 nm is investigated by nanoindentation, scanning electron microscopy and high-resolution transmission electron microscopy. In a deviation from molecular dynamics simulations and existing experimental observations on other bcc nanocrystalline metals, the plastic deformation of nanocrystalline Ta during nanoindentation is controlled by deformation twinning. The observation of multiple twin intersections suggests that the physical mechanism of deformation twinning in bcc nanocrystalline materials is different from that in face-centered cubic (fcc) nanocrystalline metals.
ACCESSION #
16581483

 

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