Abstract
The effect of anodic oxide films on the mechanical behavior of single crystals of niobium and tantalum was investigated. Near room temperature, oxide films cause an increase in strength, in the manner generally observed for face-centered cubic crystals. At lower temperatures, oxide films reduce the yield stress and its temperature dependence and cause serrated flow over an appreciable range of strains. When the oxide films are removed from specimens deformed at lower temperatures, the serrations disappear during subsequent deformation, and the yield stress increases rapidly to that of the uncoated material. A model involving generation and motion of edge dislocations from the oxide-metal interface is used to explain the results.
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