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Title: 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 108 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.

Authors:
ORCiD logo; ORCiD logo; ; ; ; ; ; ; ; ORCiD logo; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES); French National Research Agency (ANR)
OSTI Identifier:
1829540
Alternate Identifier(s):
OSTI ID: 1868366
Grant/Contract Number:  
AC02-76SF00515; I-SITE ULNE R-ERCGEN-19-006-MERKEL; ANR-16-IDEX-0004
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters Journal Volume: 127 Journal Issue: 20; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; defects; mechanical deformation; microstructure; plasticity; pressure effects; shock waves; structural properties; twinning

Citation Formats

Merkel, Sébastien, Hok, Sovanndara, Bolme, Cynthia, Rittman, Dylan, Ramos, Kyle James, Morrow, Benjamin, Lee, Hae Ja, Nagler, Bob, Galtier, Eric, Granados, Eduardo, Hashim, Akel, Mao, Wendy L., and Gleason, Arianna E. Femtosecond Visualization of hcp-Iron Strength and Plasticity under Shock Compression. United States: N. p., 2021. Web. doi:10.1103/PhysRevLett.127.205501.
Merkel, Sébastien, Hok, Sovanndara, Bolme, Cynthia, Rittman, Dylan, Ramos, Kyle James, Morrow, Benjamin, Lee, Hae Ja, Nagler, Bob, Galtier, Eric, Granados, Eduardo, Hashim, Akel, Mao, Wendy L., & Gleason, Arianna E. Femtosecond Visualization of hcp-Iron Strength and Plasticity under Shock Compression. United States. https://doi.org/10.1103/PhysRevLett.127.205501
Merkel, Sébastien, Hok, Sovanndara, Bolme, Cynthia, Rittman, Dylan, Ramos, Kyle James, Morrow, Benjamin, Lee, Hae Ja, Nagler, Bob, Galtier, Eric, Granados, Eduardo, Hashim, Akel, Mao, Wendy L., and Gleason, Arianna E. Tue . "Femtosecond Visualization of hcp-Iron Strength and Plasticity under Shock Compression". United States. https://doi.org/10.1103/PhysRevLett.127.205501.
@article{osti_1829540,
title = {Femtosecond Visualization of hcp-Iron Strength and Plasticity under Shock Compression},
author = {Merkel, Sébastien and Hok, Sovanndara and Bolme, Cynthia and Rittman, Dylan and Ramos, Kyle James and Morrow, Benjamin and Lee, Hae Ja and Nagler, Bob and Galtier, Eric and Granados, Eduardo and Hashim, Akel and Mao, Wendy L. and Gleason, Arianna E.},
abstractNote = {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 108 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.},
doi = {10.1103/PhysRevLett.127.205501},
journal = {Physical Review Letters},
number = 20,
volume = 127,
place = {United States},
year = {2021},
month = {11}
}

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