Other
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.1683j&link_type=abstract
Journal of Geophysical Research, vol. 84, Apr. 10, 1979, p. 1683-1688. Research supported by the Research Corp.
Other
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Ataxite, Fractography, Impact Strength, Iron Meteorites, Low Temperature, Nickel, Asteroids, Brittleness, Charpy Impact Test, Ductility, Electron Microscopy, Fine Structure, Microstructure, Troilite, X Ray Imagery, Meteorites, Temperatures, Collisions, Hoba Meteorite, Nickel, Troilite, Fragments, Artificial Impacts, Minerals, Parent Bodies, Iron, Sulphur, Chromium, Hypotheses, Particles, Charpy Impact Test, Composition
Scientific paper
Standard V-notch Charpy impact specimens prepared from the high-nickel ataxite Hoba material are tested at 77 and 195 K. The energies absorbed during fracture at these two temperatures indicate that the Hoba material is totally brittle at 77 K and totally ductile at 195 C. Since ductile-brittle transition occurs over a range of several tens of degrees, it can be concluded that transition to complete brittleness takes place below about 140-150 K. This means that the Hoba material is most likely ductile at the ambient temperature of an asteroid. The results tend to support Remo and Johnson's (1974) hypothesis that high-nickel meteorites are on the average much larger than others because high-nickel material did not fragment into small pieces by brittle fracture when meteorite material was formed by the collision of asteroids. The microstructure of Hoba is found to consist of fine plessite with prolific small mineral inclusions, in agreement with the observations of earlier workers.
Davis R. B.
Johnson Adrian
Remo John L.
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