Physics – Condensed Matter – Materials Science
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jmats..16..515h&link_type=abstract
Journal of Materials Science, vol. 16, Feb. 1980, p. 515-522.
Physics
Condensed Matter
Materials Science
2
Cracking (Fracturing), Meteoritic Composition, Meteoritic Microstructures, Nickel, Phase Transformations, Phosphorus, Brittleness, Close Packed Lattices, Crack Initiation, Face Centered Cubic Lattices, Impact Damage, Nucleation, Phosphides, Precipitates, Precipitation Hardening, Shock Waves, Meteorites, Features, Cracks, Comparisons, Electron Microscopy, Origin, Composition, Temperatures, Formation, Microstructure, Iron Meteorites, Fractures, Shock Waves, Collisions, Photomicrographs, Nickel, Phosphide, Sam
Scientific paper
Cracks in four meteorites with different nickel and phosphorus contents were investigated by optical microscopy. There are two types of cracks, those formed at elevated temperatures, and those formed at temperatures below 300 C. The former modify the microstructure of the meteorite by acting as additional nucleation sites for the gamma to alpha transformation of phosphide precipitation. The low-temperature cracks show the typical features of brittle fracture of steel. Fracture along the gamma to alpha phase boundaries often disappears if Fe3P precipitates at these interfaces as small particles. If reheating effects can be excluded, it is likely that the high-temperature cracks have been formed by shockwaves during a collision in the asteroid belt; they provide an important source of information on this event, if it occurs in the temperature range in which the gamma-phase is stable.
Hornbogen E.
Minuth E.
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