Abstract
Constant contact pressure (CCP) nanoindentation method is an emerging approach to studying the creep properties of materials at the micrometer scale. However, in the literature, the possible loss of contact when applying the CCP method may not accommodate low contact pressures when testing materials at high homologous temperatures. Here, we improve the previous CCP method by changing its control strategy and achieve a steady-state CCP nanoindentation creep on an example material, β-Sn, without the loss of contact. Our results show the measured power law stress exponent on the < 001 >-oriented grain is 7.1–8.5. Nevertheless, our CCP method still suffers from the inevitable scattering of measured contact pressures and strain rates. In this study, we also find that the stress relaxation during 5-s unloading induces significant plastic strain, which affects materials’ creep thereafter.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.
Code availability
The method file of the latest version of constant contact pressure is available from the corresponding author upon reasonable request. (Specifically applied to KLA nanoindenters).
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Acknowledgments
The authors acknowledge the technical support from M. Haché at the Department of Materials Science and Engineering at the University of Toronto, for the training and maintenance of the iMicro nanoindentation system. L.L. acknowledges the discussion with Dr.-Ing. K. Durst, Dr. V. Maier-Kiener, Dr. D. Kiener, and Dr. S. Van Petegem. The authors acknowledge Z. Carroll and A. Marchesan for proofreading the manuscript.
Funding
This work was supported by NSERC, Discovery Grant #RGPIN-2018-05731 and CFI-John R. Evans Leaders Fund (JELF) Project #38044. L.L.
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LL contributed to Conceptualization, Methodology, Mechanical experiments, Writing of the original draft, and Writing, reviewing, & editing of the manuscript. ZL contributed to Methodology and Writing, reviewing, & editing of the manuscript. TL contributed to Methodology, SEM characterization, and Writing, reviewing, & editing of the manuscript. YZ contributed to Conceptualization, Supervision, and Writing, reviewing, & editing of the manuscript.
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Lang, L., Liu, Z., Lyu, T. et al. Steady-state nanoindentation creep test on β-Sn: A modified constant contact pressure method. Journal of Materials Research 39, 881–890 (2024). https://doi.org/10.1557/s43578-023-01277-2
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DOI: https://doi.org/10.1557/s43578-023-01277-2