TEM study of an analogue of the Earth's inner core ɛ-Fe

Details TEM study of an analogue of the Earth's inner core ɛ-Fe TEM study of an analogue of the Earth's inner core ɛ-Fe

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pepi..129..347p&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 129, Issue 3-4, p. 347-358.

Physics

1

Scientific paper

Metallurgists know that a hexagonal close-packed phase (ɛ-martensite) is formed by straining at low temperature or pressurization of nickel-chromium stainless steels. In many respects, the ɛ-martensite is similar to the hexagonal phase of iron thought to constitute the Earth's inner core (ɛ-Fe), but, contrary to ɛ-Fe, it is metastable at atmospheric pressure. Observation of dislocations in ɛ-martensite in transmission electron microscopy (TEM) may thus provide information on the deformation mechanisms of the inner core alloy. Samples of 18 Cr-8 Ni austenitic stainless steel have been pressurized at 13GPa and 800°C, in a multi-anvil press and 30GPa and RT, in a diamond-anvil cell. Subsequent TEM study shows that thin lamellae of ɛ-phase form on {111} planes of the fcc austenite. They were accompanied by crystals of bcc α'-martensite. In one case, a few dislocations were observed in a glide band of the ɛ-phase, compatible with second order pyramidal slip {112¯2}<112¯3>. The observations suggest that ɛ-martensite, hence presumably ɛ-Fe, deforms by slip on the basal plane and second order pyramidal planes, as hexagonal cobalt.

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