By Dennis R. Floyd, John N. Lowe
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Extra resources for Beryllium Science and Technology: Volume 2
Example text
Knowledge gained over the past 20 years has shown that VIM of beryllium is a viable source of material for conventional metal-working processes. Although there have been a limited number of investigations and our depth of knowledge has progressed rather slowly, several problems related to beryllium casting have been solved. Investigators have recognized the need for unidirectional solidification and controlling heat transfer and cooling rates during freezing. Beryllium is quite susceptible to gas porosity and internal cracking, and controlling melt chemistry is a major factor.
Such milling of coarse chip or powder produces some powder of the desired fineness, and repeated passes are needed to attain practical production rates and yields. In consolidating beryllium powder, a combination of powder grade and consolidation process is selected in order to provide the properties required of the compact. , and property specifications include density, strength, ductility, modulus, and cleanliness. , extrusions, sheet, foil, wire, and the powder composition and consolidation method are adjusted to assure that the compact will be workable and that target propexties will be attained in the final wrought form.
M. Tench, and P. B. Petretzky, Beryllium Chip Processing, Union Carbide Nuclear Co. Report No. Y-1328 (December 1960). 2. G. I. Turner and P. V. Livesey, Notes on the Centrifugal Shot Casting (CSC) Processing of Beryllium, private communication (April1978). 3. P. ), private communication (Aprill978). 4. Author unknown, Beryllium Fabricated from Quenched Particles, Dow Metal Products Co. Final Report (October 1959). 5. A. R. Kaufmann and W. C. Muller, Fine Grain Size in Beryllium by Splat-cooling, Nuclear Metals Division of Textron (October 1964).
