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Title: Rheology of ε-iron up to 19 GPa and 600 K in the D-DIA
Authors: Nishiyama, N
Wang, YD
Rivers, ML
Sutton, SR
Cookson, DJ
Keywords: Earth core
Crystal structure
Issue Date: 7-Dec-2007
Publisher: American Geophysical Union
Citation: Nishiyama, N., Wang, Y., Rivers, M. L., Sutton, S. R., & Cookson, D. (2007). Rheology of epsilon-iron up to 19 GPa and 600 K in the D-DIA. Geophysical Research Letters, 35(23), L23304. doi:10.1029/2007GL031431
Abstract: Stress-strain curves, i.e., relations between the differential stress and macroscopic sample strain, of polycrystalline ε-iron have been obtained at pressures of 17(±1) GPa, three different temperatures (600, 400, and 300 K), and various strain rates between 3.8 × 10−6 and 2.3 × 10−5 s−1 using the deformation-DIA coupled with monochromatic X-rays. Five independent stress-strain curves were obtained on axial shortening and the sample exhibited ductile behavior in all. Above 4% axial strain, sample stresses reach saturation and the sample exhibited steady-state deformation. Stress exponents at temperatures of 400 and 600 K were determined to be ∼31 and ∼7, respectively. These results indicate that ε-iron deforms in plasticity regime below 400 K and that the dominant deformation mechanism at 600 K may be low temperature power-law creep. The overall deformation behavior for ε-iron is consistent with that of zinc, suggesting that the deformation mechanism map of ε-iron resembles those of other hexagonal metals. © 2007, American Geophysical Union
Gov't Doc #: 1194
ISSN: 0094-8276
Appears in Collections:Journal Articles

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