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- Title
On the Strain Rate Sensitivity Measured by Nanoindentation at High Strain Rates.
- Authors
Hackett, B. L.; Sudharshan Phani, P.; Walker, C. C.; Oliver, W. C.; Pharr, G. M.
- Abstract
The flow stress of a material can be strongly dependent on the rate of applied strain. Measuring the strain rate sensitivity can reveal key insights into the mechanisms that drive plastic deformation. Indentation techniques have been developed to measure the strain rate sensitivity at quasistatic strain rates, but accessing higher strain rate regimes has been saddled with experimental and technical challenges. With state-of-the-art indentation instrumentation now capable of recording load and displacement at data acquisition rates in excess of 1.25 MHz, we report how strain rate sensitivity testing methodologies, especially those aimed for higher indentation strain rates, may be validated using the well-studied time-dependent deformation behavior of tungsten. The strain rate sensitivity for a (110) single crystal is shown to be consistent (m = 0.023 at 2-µm depth) across all tested strain rates and methods ranging from 10−2 1/s to 104 1/s.
- Subjects
STRAIN rate; NANOINDENTATION; MATERIAL plasticity; SINGLE crystals; ACQUISITION of data
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2024, Vol 76, Issue 6, p2936
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-06338-9