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Field‐ion microscopy of iron‐molybdenum solid solutions
Author(s) -
Papazian J. M.
Publication year - 1972
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1972.tb01045.x
Subject(s) - molybdenum , field ion microscope , ion , analytical chemistry (journal) , radius , chemistry , nitrogen , bright spot , optical microscope , carbon fibers , materials science , scanning electron microscope , inorganic chemistry , optics , physics , chromatography , computer security , composite material , organic chemistry , composite number , computer science
SUMMARY The average density of bright spots in the (200) region of field‐ion microscope images is found to be related to the nominal molybdenum composition in a series of iron‐molybdenum alloys containing 1/2 to 5 weight percent molybdenum. The bright spot density is found to be proportional to the square of the tip radius and is thus linearly related to the surface area. This indicates that a correlation between the observed bright spot density and a bulk property is permissable. The bright spot density is also found to increase approximately linearly with molybdenum content, at least up to 3% molybdenum. Observation of specimens with similar amounts of molybdenum in solid solution but different nitrogen contents shows that the observed correlation is independent of the nitrogen content. Similarly, it is shown that the correlation is also independent of carbon content. Thus, it is concluded that the bright spot density is directly related to the amount of molybdenum in solid solution and can be used as a measure of the local molybdenum concentration. The nature of the bright spot contrast is discussed and is shown to be consistent with a current theory of image formation.