Rheology of $\varepsilon$-iron up to 19 GPa and 600 K in the D-DIA

Details Rheology of $\varepsilon$-iron up to 19 GPa and 600 K in the D-DIA Rheology of $\varepsilon$-iron up to 19 GPa and 600 K in the D-DIA

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3523304n&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 23, CiteID L23304

Physics

4

Mineral Physics: Creep And Deformation, Mineral Physics: High-Pressure Behavior, Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction, Tectonophysics: Rheology: General (1236, 8032)

Scientific paper

Stress-strain curves, i.e., relations between the differential stress and macroscopic sample strain, of polycrystalline $\varepsilon$-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 $\varepsilon$-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 $\varepsilon$-iron is consistent with that of zinc, suggesting that the deformation mechanism map of $\varepsilon$-iron resembles those of other hexagonal metals.

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