Effect of Minor Ce on the Microstructure of Pure Ag
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Key Words：Rareearth； Pure Ag； Microstructure; Dislocation
Abstract：The influence of minor Ce addition on the microstructures of pure Ag under ascast, coldprocessing and annealing states were systematically researched. The dislocations in the pure Ag and Ag0.1%Ce at different processing states were comparatively analyzed. The results indicated that, when the Ce content is below 0.065%, single solid solution in pure Ag was obtained under the ascast condition. As the Ce additive increases, Ag4Ce precipitate was formed. After annealing the Ag0.1%Ce alloy at 50% deformation, Ag4Ce precipitate was distributed uniformly. Transmission electron microscopy shows that Ag4Ce precipitate impeded the dislocation during the working process. The crystal formed by dislocation was whether absorbed by diffusion into the grain boundaries, or counteracted by the dislocations of minus number after annealing.
