An investigation has been made of the effect of specimen surface finish and sheathing on the tensile properties of both cast and extruded ingot and hot-pressed powder beryllium, under the influence of an applied hydrostatic pressure of 78.7 kg mm−2 (7.72 kbar). Three surface finishes — as-machined, chemically etched and electropolished — were investigated. For each surface finish, specimens of both materials were tested with their gauge length sections bare and sheathed with a rubberized coating. The chemical etching and the electropolishing treatments were designed to remove the damage induced by the specimen machining operations and the rubberized coating was applied to prevent the pressurizing fluid wetting the specimens. Other workers have claimed that electropolishing alone is sufficient to enable the maximum ductility of beryllium to be realized in a hydrostatic environment. However, the present investigation shows that both a post-machining surface treatment and the application of a rubberized coating are necessary before this condition is attained. The data also suggest that beryllium exhibits a Rebinder effect.
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Chandler, E., Lindsay, M.H.M., Pugh, H.L.D. et al. The effect of surface finish on the pressure-induced ductility of beryllium. J Mater Sci 8, 1788–1794 (1973). https://doi.org/10.1007/BF00552191
- Hydrostatic Pressure
- Tensile Property
- Surface Treatment