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A spall and diffraction study of nanosecond pressure release across the iron ε-α phase boundary
Abstract
The extreme response of polycrystalline iron at high pressures and high strain rates is revealed by means of high-power laser pulses. The compression portion of the pulse coupled with x-ray diffraction identifies the expected body-centered cubic (α) to hexagonal close packed (ε) displacive transformation. Upon release, observation shows that the complete reverse transformation takes approximately 8 ns and that the structure returns to its initial microstructural configuration, in a reversible transformation path. This is in good agreement with molecular dynamics (MD) simulations which predict an inverse dependence between transformation time and strain rate. The grain size is reduced from μm to nm range during compression and begins increasing back to the original grain size on decompression. The kinetics of the transition is dictated by heterogenous nucleation as it follows the Johnson-Mehl-Avrami-Kolmogorov equation with the appropriate time exponent of ~1. This is confirmed by MD simulations which also identify profuse twinning and dislocation generation. Here, the tensile pulse generated upon reflection at the free surface is captured by time-resolved free surface velocity measurements from which a peak tensile stress of 7 GPa is obtained, in stark contrast with its quasi-static value of ~200 MPa. At these strain rates, the strength ofmore »
- Authors:
-
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- CONICET and Universidad de Mendoza (Argentina)
- University of California, San Diego, La Jolla, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
- OSTI Identifier:
- 1989430
- Alternate Identifier(s):
- OSTI ID: 1989060
- Report Number(s):
- LLNL-JRNL-845223
Journal ID: ISSN 1359-6454; 1068826
- Grant/Contract Number:
- AC52-07NA27344; NA0003842; NA0003957; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 257; Journal Issue: na; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Iron; High pressure; Spall; X-ray diffraction; Phase transformation; Molecular Dynamics
Citation Formats
Righi, Gaia, Briggs, Richard, Deluigi, Orlando R., Stan, Camelia V., Singh, Saransh, Clarke, Samantha M., Bringa, Eduardo M., Smith, Raymond F., Rudd, Robert E., Park, Hye-Sook, and Meyers, Marc A. A spall and diffraction study of nanosecond pressure release across the iron ε-α phase boundary. United States: N. p., 2023.
Web. doi:10.1016/j.actamat.2023.119148.
Righi, Gaia, Briggs, Richard, Deluigi, Orlando R., Stan, Camelia V., Singh, Saransh, Clarke, Samantha M., Bringa, Eduardo M., Smith, Raymond F., Rudd, Robert E., Park, Hye-Sook, & Meyers, Marc A. A spall and diffraction study of nanosecond pressure release across the iron ε-α phase boundary. United States. https://doi.org/10.1016/j.actamat.2023.119148
Righi, Gaia, Briggs, Richard, Deluigi, Orlando R., Stan, Camelia V., Singh, Saransh, Clarke, Samantha M., Bringa, Eduardo M., Smith, Raymond F., Rudd, Robert E., Park, Hye-Sook, and Meyers, Marc A. Mon .
"A spall and diffraction study of nanosecond pressure release across the iron ε-α phase boundary". United States. https://doi.org/10.1016/j.actamat.2023.119148.
@article{osti_1989430,
title = {A spall and diffraction study of nanosecond pressure release across the iron ε-α phase boundary},
author = {Righi, Gaia and Briggs, Richard and Deluigi, Orlando R. and Stan, Camelia V. and Singh, Saransh and Clarke, Samantha M. and Bringa, Eduardo M. and Smith, Raymond F. and Rudd, Robert E. and Park, Hye-Sook and Meyers, Marc A.},
abstractNote = {The extreme response of polycrystalline iron at high pressures and high strain rates is revealed by means of high-power laser pulses. The compression portion of the pulse coupled with x-ray diffraction identifies the expected body-centered cubic (α) to hexagonal close packed (ε) displacive transformation. Upon release, observation shows that the complete reverse transformation takes approximately 8 ns and that the structure returns to its initial microstructural configuration, in a reversible transformation path. This is in good agreement with molecular dynamics (MD) simulations which predict an inverse dependence between transformation time and strain rate. The grain size is reduced from μm to nm range during compression and begins increasing back to the original grain size on decompression. The kinetics of the transition is dictated by heterogenous nucleation as it follows the Johnson-Mehl-Avrami-Kolmogorov equation with the appropriate time exponent of ~1. This is confirmed by MD simulations which also identify profuse twinning and dislocation generation. Here, the tensile pulse generated upon reflection at the free surface is captured by time-resolved free surface velocity measurements from which a peak tensile stress of 7 GPa is obtained, in stark contrast with its quasi-static value of ~200 MPa. At these strain rates, the strength of grain interiors, which is determined by twinning and slip exceeds the strength of the boundaries, and failure initiates preferentially in the latter.},
doi = {10.1016/j.actamat.2023.119148},
journal = {Acta Materialia},
number = na,
volume = 257,
place = {United States},
year = {Mon Jul 10 00:00:00 EDT 2023},
month = {Mon Jul 10 00:00:00 EDT 2023}
}
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