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Self-consistent hardness measurements spanning eleven decades of strain rate on a single material surface

Author

Listed:
  • Luciano Borasi

    (Northwestern University)

  • Christopher A. Schuh

    (Northwestern University)

Abstract

A comprehensive understanding of material strength across strain rates typically requires the combination of results from different methods, which often vary in loading conditions and/or sampled volumes, leading to discrepancies in material behavior. This study presents a microindentation approach to measure hardness covering eleven orders of magnitude in strain rate, from quasi-static to phonon drag-dominated rates, on a single material surface under uniform testing conditions. By engineering the geometry of impactors used in laser induced particle impact testing, we extend the breadth of accessible strain rates, including multiple distinct rates exceeding 10⁵ s⁻¹. This self-consistent approach provides clearer insights into high-rate deformation mechanisms. Our results demonstrate a gradual increase in hardness with strain rate from quasi-static up to ultra-high rates, where a sharp upturn in hardness is observed.

Suggested Citation

  • Luciano Borasi & Christopher A. Schuh, 2025. "Self-consistent hardness measurements spanning eleven decades of strain rate on a single material surface," Nature Communications, Nature, vol. 16(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-61445-2
    DOI: 10.1038/s41467-025-61445-2
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    References listed on IDEAS

    as
    1. Jae-Hwang Lee & David Veysset & Jonathan P. Singer & Markus Retsch & Gagan Saini & Thomas Pezeril & Keith A. Nelson & Edwin L. Thomas, 2012. "High strain rate deformation of layered nanocomposites," Nature Communications, Nature, vol. 3(1), pages 1-9, January.
    2. Ian Dowding & Christopher A. Schuh, 2024. "Metals strengthen with increasing temperature at extreme strain rates," Nature, Nature, vol. 630(8015), pages 91-95, June.
    3. Wenqing Zhu & Zhi Li & Hua Shu & Huajian Gao & Xiaoding Wei, 2024. "Amorphous alloys surpass E/10 strength limit at extreme strain rates," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    4. Mostafa Hassani-Gangaraj & David Veysset & Keith A. Nelson & Christopher A. Schuh, 2018. "Melt-driven erosion in microparticle impact," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
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