Relationship between Superlattice Structures and Electrochemical Behaviors of Copper-Gold Alloys
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The effect of crystal defects on the electrochemical behavior of copper-gold alloys having disordered structures and superlattice structures of Cu_3Au I, CuAu I, CuAu II and CuAu_3 has been investigated by means of a potentiostat and an electron microscope. Electrochemical measurements showed that ordered alloys were more active than disordered alloy of the same composition, contary to the concept that alloys with a lower free energy are chemically more stable. Among the alloys of the same composition having superlattice structures, the alloy annealed for a long time was found to be chemically more stable than that annealed for a short time. These results suggest that the densities of crystal defects such as the boundaries of anti-phase domains, twins and grains, which are the chemically active areas in corrosive atmospheres, should be the highest in ordered alloy annealed for a short time and the lowest in disordered alloy. The chemical activity of these crystal defects are considered to be due to the potential differences which arise owing to disturbance of the electron configuration.
- 東北大学の論文
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