Shock-loading meteoritic b.c.c. metal above the pressure transition - Remanent-magnetization stability and microstructure

Details Shock-loading meteoritic b.c.c. metal above the pressure transition - Remanent-magnetization stability and microstructure Shock-loading meteoritic b.c.c. metal above the pressure transition - Remanent-magnetization stability and microstructure

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pepi...11....5w&link_type=abstract

Physics of the Earth and Planetary Interiors, vol. 11, no. 3, Jan. 1976, p. P5-P11.

Physics

7

Magnetization, Metal Crystals, Meteorite Collisions, Meteoritic Microstructures, Remanence, Shock Loads, Anatase, Body Centered Cubic Lattices, Impact Loads, Iron Alloys, Metallography, Nickel Alloys, Phase Transformations

Scientific paper

The paper describes the remanent-magnetization stability and microstructure associated with samples of b.c.c. Fe-Ni from the Odessa meteorite which were shock loaded at 200, 400, 600, 800, and 1000 kbar. The samples include those which were transformation hardened as well as those which were altered by varying thermal levels associated only with the shock levels themselves. Demagnetization curves for an unshocked Odessa sample and for samples shocked at each level are presented along with saturation isothermal remanence demagnetization curves for samples shocked at 600 and 1000 kbar. It is found that: (1) the 200-kbar sample was shock-hardened with no significant thermal effects; (2) stability to demagnetization decreased in the 400- and 600-kbar specimens, indicating that recovery took place; and (3) the specimens shocked at 800 and 100 kbar had the greatest demagnetization stability. These three levels of shock effects are shown to be delimited by discrete levels of microhardness, microstructure, and stability of remanence to demagnetization. It is concluded that the first level is simply a consequence of antiferromagnetic-ferromagnetic reversal and that the other two levels contain a thermal component.

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