Unique universal scaling in nanoindentation pop-ins

Yuji Sato, Shuhei Shinzato, Takahito Ohmura (), Takahiro Hatano () and Shigenobu Ogata ()
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Yuji Sato: Osaka University, 1-3 Machikaneyama
Shuhei Shinzato: Osaka University, 1-3 Machikaneyama
Takahito Ohmura: National Institute for Materials Science (NIMS), 1-2-1 Sengen
Takahiro Hatano: Osaka University, 1-1 Machikaneyama
Shigenobu Ogata: Osaka University, 1-3 Machikaneyama

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-020-17918-7

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