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Title: High–Pressure Deformation of Iron–Nickel–Silicon Alloys and Implications for Earth’s Inner Core

Abstract

Abstract Earth’s inner core exhibits strong seismic anisotropy, often attributed to the alignment of hexagonal close‐packed iron (hcp‐Fe) alloy crystallites with the Earth’s poles. How this alignment developed depends on material properties of the alloy and is important to our understanding of the core’s crystallization history and active geodynamical forcing. Previous studies suggested that hcp‐Fe is weak under deep Earth conditions but did not investigate the effects of the lighter elements known to be part of the inner core alloy. Here, we present results from radial X‐ray diffraction experiments in a diamond anvil cell that constrain the strength and deformation properties of iron‐nickel‐silicon (Fe–Ni–Si) alloys up to 60 GPa. We also show the results of laser heating to 1650 K to evaluate the effect of temperature. Observed alloy textures suggest different relative activities of the various hcp deformation mechanisms compared to pure Fe, but these textures could still account for the theorized polar alignment. Fe–Ni–Si alloys are mechanically stronger than Fe and Fe–Ni; extrapolated to inner core conditions, Si‐bearing alloys may be more than an order of magnitude stronger. This enhanced strength proportionally reduces the effectivity of dislocation creep as a deformation mechanism, which may suggest that texture developed during crystallization rathermore » than as the result of postsolidification plastic flow.« less

Authors:
ORCiD logo [1];  [1];  [2]; ORCiD logo [2];  [3]; ORCiD logo [4]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Univ. of Utah, Salt Lake City, UT (United States)
  3. Sorbonne Univ., Paris (France)
  4. Sorbonne Univ., Paris (France); Univ. Grenoble Alpes, Gières (France)
Publication Date:
Research Org.:
Univ. of Illinois, Chicago, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); H2020 European Research Council (ERC)
OSTI Identifier:
1785995
Alternate Identifier(s):
OSTI ID: 1786806
Grant/Contract Number:  
NA0003975; DGE1745303; EAR-1654687; NA0003858; 724690
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 126; Journal Issue: 3; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 58 GEOSCIENCES; inner core; iron-nickel-silicon alloy; seismic anisotropy

Citation Formats

Brennan, Matthew C., Fischer, Rebecca A., Couper, Samantha, Miyagi, Lowell, Antonangeli, Daniele, and Morard, Guillaume. High–Pressure Deformation of Iron–Nickel–Silicon Alloys and Implications for Earth’s Inner Core. United States: N. p., 2021. Web. doi:10.1029/2020jb021077.
Brennan, Matthew C., Fischer, Rebecca A., Couper, Samantha, Miyagi, Lowell, Antonangeli, Daniele, & Morard, Guillaume. High–Pressure Deformation of Iron–Nickel–Silicon Alloys and Implications for Earth’s Inner Core. United States. https://doi.org/10.1029/2020jb021077
Brennan, Matthew C., Fischer, Rebecca A., Couper, Samantha, Miyagi, Lowell, Antonangeli, Daniele, and Morard, Guillaume. Tue . "High–Pressure Deformation of Iron–Nickel–Silicon Alloys and Implications for Earth’s Inner Core". United States. https://doi.org/10.1029/2020jb021077. https://www.osti.gov/servlets/purl/1785995.
@article{osti_1785995,
title = {High–Pressure Deformation of Iron–Nickel–Silicon Alloys and Implications for Earth’s Inner Core},
author = {Brennan, Matthew C. and Fischer, Rebecca A. and Couper, Samantha and Miyagi, Lowell and Antonangeli, Daniele and Morard, Guillaume},
abstractNote = {Abstract Earth’s inner core exhibits strong seismic anisotropy, often attributed to the alignment of hexagonal close‐packed iron (hcp‐Fe) alloy crystallites with the Earth’s poles. How this alignment developed depends on material properties of the alloy and is important to our understanding of the core’s crystallization history and active geodynamical forcing. Previous studies suggested that hcp‐Fe is weak under deep Earth conditions but did not investigate the effects of the lighter elements known to be part of the inner core alloy. Here, we present results from radial X‐ray diffraction experiments in a diamond anvil cell that constrain the strength and deformation properties of iron‐nickel‐silicon (Fe–Ni–Si) alloys up to 60 GPa. We also show the results of laser heating to 1650 K to evaluate the effect of temperature. Observed alloy textures suggest different relative activities of the various hcp deformation mechanisms compared to pure Fe, but these textures could still account for the theorized polar alignment. Fe–Ni–Si alloys are mechanically stronger than Fe and Fe–Ni; extrapolated to inner core conditions, Si‐bearing alloys may be more than an order of magnitude stronger. This enhanced strength proportionally reduces the effectivity of dislocation creep as a deformation mechanism, which may suggest that texture developed during crystallization rather than as the result of postsolidification plastic flow.},
doi = {10.1029/2020jb021077},
journal = {Journal of Geophysical Research. Solid Earth},
number = 3,
volume = 126,
place = {United States},
year = {Tue Feb 02 00:00:00 EST 2021},
month = {Tue Feb 02 00:00:00 EST 2021}
}

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