A microstructural study of the Tishomingo meteorite

Details A microstructural study of the Tishomingo meteorite A microstructural study of the Tishomingo meteorite

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1051i&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, July 1978, p. 1051-1066. NASA-supported research.

Computer Science

3

Iron Meteorites, Meteoritic Microstructures, Mineralogy, Aging (Materials), Electron Microscopy, Evolution, Martensite, Metallography, Nickel, X Ray Diffraction, Iron Meteorites, Tishomingo Meteorite, Microstructure, Crystallography, Kamacite, Temperatures, Pressure, Martensite, X-Ray Diffraction, Electron Microscopy, Shock Deformation, Concentration, Thermal History, Cooling, Taenite

Scientific paper

Metallography, electron microscopy, and X-ray diffraction techniques were employed to study a fragment of the Tishomingo iron meteorite. The results suggest the following thermal-mechanical history: The fragment was originally a large crystal of taenite (gamma). Cooling through the alpha + gamma phase boundary did not result in accompanying precipitation of kamacite (alpha). Transformation to a martensitic structure initiated between -25 and -65 C. Transformation continued as the temperature fell to -75 to -115 C, resulting in approx 80% martensite (alpha-prime). Subsequent shock deformation and thermal aging processes substantially modified the taenite and martensite microstructures. Twins in the retained taenite phase are attributed to shock deformation at a pressure estimated for a single event at about 170 kbar. The existing complex altered martensite structure containing both taenite and kamacite (3-15% Ni) particles was apparently the product of both shock deformation and thermal aging processes. The maximum temperature reached during thermal aging is estimated to be less than 400 C and perhaps below 310 C.

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