The effect of nickel on the strength of iron nickel alloys: Implications for the Earth’s inner core

Reagan, Mary M.; Gleason, Arianna E.; Liu, Jin; Krawczynski, Michael J.; Van Orman, James A.; Mao, Wendy L.

doi:10.1016/j.pepi.2018.08.003

Title: The effect of nickel on the strength of iron nickel alloys: Implications for the Earth’s inner core

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Abstract

Here, we investigated the effect of nickel on the strength of iron-nickel (FeNi) alloys at high pressure. Using radial X-ray diffraction coupled with literature results from nuclear resonance inelastic X-ray scattering measurements we determined the bulk strength of two FeNi alloys (Fe_0.88Ni_0.12 and Fe_0.8Ni_0.2) at high pressures up to 70 GPa. When extrapolated to Earth’s inner core conditions, the strength of these FeNi alloys is found to increase relative to pure Fe. For the likely composition and conditions of the inner core, we estimate that an FeNi alloy with ~5.5 wt% Ni would have a strength that is ~125% greater than estimates for pure Fe. As shear strength is a measure of a material’s resistance to flow, our results have implications for understanding the deformation processes inside planetary interiors and support dislocation creep as the dominant mechanism in the Earth’s inner core.

Authors:

Reagan, Mary M. ^[1]; Gleason, Arianna E. ^[2]; Liu, Jin ^[1]; Krawczynski, Michael J. ^[3]; Van Orman, James A. ^[4]; Mao, Wendy L. ^[2]

Stanford Univ., Stanford, CA (United States)
Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Washington Univ., St. Louis, MO (United States)
Case Western Reserve Univ., Cleveland, OH (United States)

Publication Date:: Mon Aug 06 00:00:00 EDT 2018

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1490885

Alternate Identifier(s):: OSTI ID: 1703294

Grant/Contract Number:: AC02-76SF00515; AC02-05CH11231; NA0001974; FG02-99ER45775; AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Physics of the Earth and Planetary Interiors

Additional Journal Information:: Journal Volume: 283; Journal Issue: C; Journal ID: ISSN 0031-9201

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; High pressure; Strength; Earth’s inner core; Deformation; FeNi alloy

Citation Formats


                    Reagan, Mary M., Gleason, Arianna E., Liu, Jin, Krawczynski, Michael J., Van Orman, James A., and Mao, Wendy L. The effect of nickel on the strength of iron nickel alloys: Implications for the Earth’s inner core.  United States: N. p., 2018. 
Web.  doi:10.1016/j.pepi.2018.08.003.

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                    Reagan, Mary M., Gleason, Arianna E., Liu, Jin, Krawczynski, Michael J., Van Orman, James A., & Mao, Wendy L. The effect of nickel on the strength of iron nickel alloys: Implications for the Earth’s inner core.  United States.  https://doi.org/10.1016/j.pepi.2018.08.003

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                    Reagan, Mary M., Gleason, Arianna E., Liu, Jin, Krawczynski, Michael J., Van Orman, James A., and Mao, Wendy L. Mon .  
"The effect of nickel on the strength of iron nickel alloys: Implications for the Earth’s inner core".  United States.  https://doi.org/10.1016/j.pepi.2018.08.003.  https://www.osti.gov/servlets/purl/1490885.

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@article{osti_1490885,

  title        = {The effect of nickel on the strength of iron nickel alloys: Implications for the Earth’s inner core},

  author       = {Reagan, Mary M. and Gleason, Arianna E. and Liu, Jin and Krawczynski, Michael J. and Van Orman, James A. and Mao, Wendy L.},

  abstractNote = {Here, we investigated the effect of nickel on the strength of iron-nickel (FeNi) alloys at high pressure. Using radial X-ray diffraction coupled with literature results from nuclear resonance inelastic X-ray scattering measurements we determined the bulk strength of two FeNi alloys (Fe0.88Ni0.12 and Fe0.8Ni0.2) at high pressures up to 70 GPa. When extrapolated to Earth’s inner core conditions, the strength of these FeNi alloys is found to increase relative to pure Fe. For the likely composition and conditions of the inner core, we estimate that an FeNi alloy with ~5.5 wt% Ni would have a strength that is ~125% greater than estimates for pure Fe. As shear strength is a measure of a material’s resistance to flow, our results have implications for understanding the deformation processes inside planetary interiors and support dislocation creep as the dominant mechanism in the Earth’s inner core.},

  doi          = {10.1016/j.pepi.2018.08.003},

  journal      = {Physics of the Earth and Planetary Interiors},

  number       = C,

  volume       = 283,

  place        = {United States},

  year         = {Mon Aug 06 00:00:00 EDT 2018},

  month        = {Mon Aug 06 00:00:00 EDT 2018}

}

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