Deformation of polycrystalline iron up to 30GPa and 1000K

Details Deformation of polycrystalline iron up to 30GPa and 1000K Deformation of polycrystalline iron up to 30GPa and 1000K

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..145..239m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 145, Issue 1-4, p. 239-251.

Physics

22

High Pressure, Deformation, Iron, Slip System, Texture, Anisotropy, Earth Core

Scientific paper

Angle-dispersive radial X-ray diffraction measurements were conducted on α- and ɛ-Fe under nonhydrostatic stress conditions up to 30GPa and 1000K in laser heated diamond anvil cells. α-Fe (bcc) is found to develop preferred orientation compatible with observations under ambient conditions. The preferred orientation of the α-phase is inherited by the ɛ-phase (hcp) in accordance with the Burgers orientation relationship. A comparison between the observed texture in ɛ-Fe with results from polycrystal plasticity modeling suggests that the predominant deformation mechanisms are basal slip (0001)<1¯21¯0> and prismatic slip {101¯0}<1¯21¯0>, presumably associated with minor mechanical twinning. We do not observe any evidence of slip on the {112¯2}<112¯3> system that was proposed based on analogies with Cr-Ni stainless steel. Finally, we do not observe any change in preferred orientation upon heating in situ at 28GPa and 1000K.

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