BROWSE

Related Researcher

Author

Kim, Ju-Young
Robust Multifunctional Materials Lab
Research Interests
  • Flexible / stretchable devices, nano-mechanics, nanoporous metal, materials reliability

ITEM VIEW & DOWNLOAD

Nanoscale room temperature creep of nanocrystalline nickel pillars at low stresses

Cited 10 times inthomson ciCited 9 times inthomson ci
Title
Nanoscale room temperature creep of nanocrystalline nickel pillars at low stresses
Author
Choi, In-ChulKim, Yong-JaeSeok, Moo-YoungYoo, Byung-GilKim, Ju-YoungWang, YinminJang, Jae-il
Keywords
Activation volume; Creep strain; Free surfaces; Grain-boundary diffusion; Grain-boundary slidings; Low stress; Nano scale; Nano-crystalline nickel; Nanocrystallines; Nanomechanical property; Nominal yield strength; Room temperature; Size effects; Stress exponents; Time-dependent; Uniaxial creep
Issue Date
201302
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
INTERNATIONAL JOURNAL OF PLASTICITY, v.41, no., pp.53 - 64
Abstract
Nanoscale time-dependent plastic deformation (creep) behavior of nanocrystalline (nc) Ni, at low stresses and at room temperature, was systematically explored through uniaxial creep experiments performed on nano-/micro-pillars (with diameters of 600, 1000, and 2000 nm). It was revealed that the creep indeed occurs at ambient temperature, and exhibits a creep strain of similar to 2 x 10(-4)-9 x 10(-3) (for 200 s load-holding) at stresses below the nominal yield strengths of the pillars. At a given stress, much higher total creep strains and strain rates accrue in the smaller pillars, which is likely due to the increased contributions of free surfaces. Estimation of the stress exponent and the activation volume suggests that the nanoscale creep event under low stresses may be dominated by diffusion-controlled mechanisms such as free surface assisted grain-boundary diffusion and grain-boundary sliding.
URI
Go to Link
DOI
http://dx.doi.org/10.1016/j.ijplas.2012.08.008
ISSN
0749-6419
Appears in Collections:
MSE_Journal Papers

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qr_code

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU