Abstract
A model for the stacking fault energy, γ, in noble metals and their alloys is developed which qualitatively explains many features of experimental observations. The model is based on bothd band and free electron contributions to the cohesion. An important prediction of the model is that γ can be decreased in noble metal alloys by the addition of a solute with an emptyd band withZ = 1 (i.e., lithium in silver). Measurements of γ were made as a function of lithium concentration in a series of Ag-Li alloys up to 25 at. pct Li using the node method. The results show that γ decreases with the addition of lithium in a manner predicted by the model.
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