Ratio of Vacancy Jump Frequencies around and away from Copper Impurity Atoms in Aluminum

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Abstract
During the precipitation of a supersaturated solution of vacancies in a dilute aluminum-copper alloy, large vacancy condensation cavities are formed at the metal-oxide interface of the alloy. The vacancy current that produced these cavities was directly determined from the cavity volume. A microprobe examination in and around the cavities determined the copper impurity current which had been generated by the vacancy current forming these cavities. From the values of the vacancy and copper impurity currents found in the experiment, the ratio of the jump frequency of a vacancy away from a copper impurity atom to that around a copper impurity atom is calculated. This ratio suggests a very small binding between a vacancy and a copper impurity and/or a slight increase in the jump frequency of solvent atoms next to the undersized copper impurity.
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