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Strain-dependent transition of time-dependent deformation mechanism in single-crystal ZnO evaluated by spherical nanoindentation

Title
Strain-dependent transition of time-dependent deformation mechanism in single-crystal ZnO evaluated by spherical nanoindentation
Author
장재일
Keywords
nanoindentation; ZnO; creep
Issue Date
2015-06
Publisher
TAYLOR & FRANCIS LTD
Citation
PHILOSOPHICAL MAGAZINE, v. 95, Page. 1896-1906
Abstract
We have systematically explored the time-dependent plasticity of (0001)-oriented ZnO single crystal through spherical indentation tests. Constant load indentation creep tests were performed in elastic strain and elastic-plastic strain regimes. In both regimes, creep indeed occurred at ambient temperature. With the observed quasi-steady-static strain rate, the stress exponent was found as similar to 1.361 for elastic contact regime and similar to 3.077 for elastic-plastic regime, suggesting predominant creep mechanism of diffusion and dislocation, respectively. This strain-dependent transition of creep mechanism is discussed in terms of possible factors affecting the creep in each regime.
URI
http://www.tandfonline.com/doi/abs/10.1080/14786435.2014.926036http://hdl.handle.net/20.500.11754/25415
ISSN
1478-6435; 1478-6443
DOI
10.1080/14786435.2014.926036
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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