REVIEW OF RECENT DEVELOPMENTS. BERYLLIUM.
BATTELLE MEMORIAL INST COLUMBUS OH DEFENSE METALS INFORMATION CENTER
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A study of the flow and fracture characteristics of beryllium has been undertaken at the Franklin Institute Research Laboratories. The objective is to study the means for producing an alloy or form of the purified metal having useful ductility in an engineering sense. The materials being studied are 12-pass SR beryllium single crystals and the alloys Be-5.24Ni and Be-4.3Cu. The structure of these materials has been characterized by transmission microscopy techniques. An unexpected nickel-rich grain-boundary precipitate was noticed and determined to be Be21Ni5 by microprobe analysis. Lattice parameter determinations made using the Kossel technique indicated C equals 3.5911A plus or minus 0.0001A. These materials are being tested by c-axis microstrain compression testing. The 12-pass SR single-crystal material was tested at room temperature, 220 C 428 F, and 333 C 631 F BE-4.37Cu at 364 C 687 F and Be-5.24Ni at room temperature, 177 C 351 F, and 354 C 669 F. The interesting result from these tests was that the high-purity material showed considerable microstrain plasticity at 333 C.
- Metallurgy and Metallography