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Femtosecond Visualization of hcp-Iron Strength and Plasticity under Shock Compression

Abstract : Iron is a key constituent of planets and an important technological material. Here, we combine in situ ultrafast x-ray diffraction with laser-induced shock compression experiments on Fe up to 187(10) GPa and 4070(285) K at 10^8  s−1 in strain rate to study the plasticity of hexagonal-close-packed (hcp)-Fe under extreme loading states. {10-12} deformation twinning controls the polycrystalline Fe microstructures and occurs within 1 ns, highlighting the fundamental role of twinning in hcp polycrystals deformation at high strain rates. The measured deviatoric stress initially increases to a significant elastic overshoot before the onset of flow, attributed to a slower defect nucleation and mobility. The initial yield strength of materials deformed at high strain rates is thus several times larger than their longer-term flow strength. These observations illustrate how time-resolved ultrafast studies can reveal distinctive plastic behavior in materials under extreme environments.
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Soumis le : lundi 15 novembre 2021 - 11:26:52
Dernière modification le : vendredi 1 avril 2022 - 03:45:45
Archivage à long terme le : : mercredi 16 février 2022 - 20:12:15


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Sébastien Merkel, Sovanndara Hok, Cynthia Bolme, Dylan Rittman, Kyle James Ramos, et al.. Femtosecond Visualization of hcp-Iron Strength and Plasticity under Shock Compression. Physical Review Letters, American Physical Society, 2021, Physical Review Letters, 127 (20), pp.205501. ⟨10.1103/physrevlett.127.205501⟩. ⟨hal-03428672⟩



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