Microscopic structural change in a liquid Fe-C alloy of ~5 GPa

Shibazaki, Yuki; Kono, Yoshio; Fei, Yingwei

doi:10.1002/2015GL064271

Title: Microscopic structural change in a liquid Fe-C alloy of ~5 GPa

Journal Article · Sat Jul 04 00:00:00 EDT 2015 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2015GL064271· OSTI ID:1335850

Shibazaki, Yuki ^[1]; Kono, Yoshio ^[2]; Fei, Yingwei ^[3]

Tohoku Univ., Sendai (Japan); Carnegie Institution of Washington, Washington, D.C. (United States)
Carnegie Institution of Washington, Argonne, IL (United States)
Carnegie Institution of Washington, Washington, D.C. (United States)

Abstract The structure of a liquid Fe‐3.5 wt % C alloy is examined for up to 7.2 GPa via multiangle energy‐dispersive X‐ray diffraction using a Paris‐Edinburgh type large‐volume press. X‐ray diffraction data show clear changes in the pressure‐dependent peak positions of structure factor and reduced pair distribution function at 5 GPa. These results suggest that the liquid Fe‐3.5 wt % C alloys change structurally at approximately 5 GPa. This finding serves as a microscopic explanation for the alloy's previously observed density change at the same pressure. The pressure dependencies of the nearest and second neighbor distances of the liquid Fe‐3.5 wt % C alloy are similar to those of liquid Fe which exhibits a structural change near the bcc‐fcc ‐liquid triple point (5.2 GPa and 1991 K). Similarities between Fe‐3.5 wt % C and Fe suggest that a density change also occurs in liquid Fe and that this structural change extends to other Fe‐light element alloys.

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Research Organization:: Carnegie Institution of Washington, Washington, D.C. (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002006; AC02-06CH11357; EAR-1128799; FG02-94ER14466

OSTI ID:: 1335850

Alternate ID(s):: OSTI ID: 1785803

Journal Information:: Geophysical Research Letters, Vol. 42, Issue 13; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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