Strain-dependent transition of time-dependent deformation mechanism in single-crystal ZnO evaluated by spherical nanoindentation
- Authors
- Kim, Yong-Jae; Choi, In-Chul; Lee, Jung-A; Seok, Moo-Young; Jang, Jae-il
- Issue Date
- Jun-2015
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- nanoindentation; ZnO; creep
- Citation
- PHILOSOPHICAL MAGAZINE, v.95, no.16-18, pp.1896 - 1906
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHILOSOPHICAL MAGAZINE
- Volume
- 95
- Number
- 16-18
- Start Page
- 1896
- End Page
- 1906
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/157135
- DOI
- 10.1080/14786435.2014.926036
- ISSN
- 1478-6435
- 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.
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