2020年8月
Unique universal scaling in nanoindentation pop-ins
Nature Communications
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- 巻
- 11
- 号
- 1
- 開始ページ
- 4177
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/s41467-020-17918-7
- 出版者・発行元
- Springer Science and Business Media LLC
Power laws are omnipresent and actively studied in many scientific fields, including plasticity of materials. Here, we report the power-law statistics in the second and subsequent pop-in magnitudes during load-controlled nanoindentation testing, whereas the first pop-in is characterized by Gaussian-like statistics with a well-defined average value. The transition from Gaussian-like to power-law is due to the change in the deformation mechanism from dislocation nucleation to dislocation network evolution in the sharp-indenter induced abruptly decaying stress and dislocation density fields. Based on nanoindentation testing on the (100) and (111) surfaces of body-centered cubic (BCC) iron and the (100) surface of face-centered cubic (FCC) copper, the scaling exponents of the power laws were determined to be 5.6, 3.9, and 6.4, respectively. These power-law exponents are much higher than those typically observed in micro-pillar plasticity (1.0-1.8), suggesting that the nanoindentation plasticity belongs to a different universality class than the micro-pillar plasticity. Although power laws are observed during nanoindentation and the power-law exponents are estimated to be approximately 1.5-1.6 for face-centered cubic metals, the origin of the exponent remains unclear. In this paper, we show the power-law statistics in pop-in magnitudes and unveil the nature of the exponent.
- リンク情報
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- DOI
- https://doi.org/10.1038/s41467-020-17918-7
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000569766000003&DestApp=WOS_CPL
- URL
- http://www.nature.com/articles/s41467-020-17918-7.pdf
- URL
- http://www.nature.com/articles/s41467-020-17918-7
- ID情報
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- DOI : 10.1038/s41467-020-17918-7
- ISSN : 2041-1723
- eISSN : 2041-1723
- ORCIDのPut Code : 79160339
- Web of Science ID : WOS:000569766000003