Abstract
The electron opacity of anodic films formed on aluminum—copper alloys in an alkaline electrolyte under well controlled conditions is a function of the copper content of the alloys. This relation permits the development of a quantitative electron optical replica for application in revealing solute distribution and for measuring solute concentration. These replicas are extremely sensitive to small variations in copper concentrations in solid solution on a finer scale than can be defined by existing electron optical methods. Application of this replica technique to a study of aged aluminum—copper alloys has revealed some new aspects of the decomposition process.
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