Abstract
F.I.M. observations of the completely imaged (102) plane of dilute Pt base alloys (W-, Pd-, Co-, Ni-, AuPt) have been made. Bright spot concentration equal to the solute concentration was found in the WPt system. Vacant site concentrations equal to the solute concentrations were found for the other systems above 2 at.% nominal solute concentration. On the basis of these observations it was concluded that the bright spots and vacant sites represented the lattice sites of solute atoms in the corresponding binary solid solutions. At and below 2 at.% nominal solute concentration, the vacant site concentration exceeded the solute concentration by about 1 at.%. This discrepancy was not resolved in the present investigation. It was found that solute clustered in the AuPt system and ordered in the WPt system. Relative to the random distribution more solute-solute pairs are found in the AuPt system and less such pairs are found in the other systems studied. It was concluded that a quantitative measurement of short range order in dilute Pt base binary alloys by means of such F.I.M. observations is feasible.
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