Estimating the stress exponent of nanocrystalline nickel: Sharp vs. spherical indentation
- Authors
- Choi, In-Chul; Yoo, Byung-Gil; Kim, Yong-Jae; Seok, Moo-Young; Wang, Yinmin; Jang, Jae-il
- Issue Date
- Aug-2011
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Nanoindentation; Creep; Nanocrystalline materials; Nickel
- Citation
- SCRIPTA MATERIALIA, v.65, no.4, pp.300 - 303
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCRIPTA MATERIALIA
- Volume
- 65
- Number
- 4
- Start Page
- 300
- End Page
- 303
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/167834
- DOI
- 10.1016/j.scriptamat.2011.04.031
- ISSN
- 1359-6462
- Abstract
- To overcome the newly found difficulties in estimating the creep exponent through the popular constant-load, sharp-indentation creep method, we propose here a modified way that involves using a spherical tip. Both sharp and spherical indentation creep experiments were performed on nanocrystalline nickel (similar to 30 nm), which is known to show creep-like behavior at room temperature. The results suggest that nanocrystalline nickel exhibits a strong strain-rate-dependent deformation mechanism, and that spherical indentation creep may produce more reliable data than sharp indentation creep.
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