A study of four pallasites using metallographic, microhardness and microprobe techniques

Details A study of four pallasites using metallographic, microhardness and microprobe techniques A study of four pallasites using metallographic, microhardness and microprobe techniques

Jul 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28.1165m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 7, pp.1165-1166

Computer Science

1

Scientific paper

The proportions by volume of kamacite, taenite and non-metallic phases have been determined by quantitative metallography in four pallasites: Admire, Krasnoyarsk, Brenham and Mount Vernon. Using the ratio of the kamacite/taenite phases and the Fe-Ni phase diagram, the lowest temperature ( T O ) at which these phases existed in equilibrium has been estimated. For the four pallasites these temperatures are substantially higher, and they show a wider scatter, than was observed in a previous study of five octahedrites. Metallographic and microhardness studies have shown "zoning structures" in the taenite phase near the kamacite/ taenite border. Microprobe studies of a zoned portion of the Brenham pallasite have shown these features to be dependent upon composition. The composition profiles of nickel and iron obtained by microprobe analysis of pallasites are strikingly similar to those obtained for octahedrites and may be interpreted with the use of the Fe-Ni binary phase diagram without the necessity for considering large pressures. The composition profiles of cobalt and phosphorous are also reported. It is concluded that pallasites have cooled more rapidly than octahedrites.

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