PREPARATION AND EVALUATION OF HIGH PURITY BERYLLIUM. Bi-Monthly Progress Report, July 2 to September 1, 1961
Technical Report
·
OSTI ID:4837550
The zone refining of one inch diameter Pechiney beryllium (extruded powder rod) was attempted and discontinued after three zone passes owing to the inability of the molten zones to concentrate the dross to the "finish" end. Other "starting" beryllium was zone refined as follows: four passes on one inch diameter Brush vacuum cast bar; five passes on one quarter inch diameter vacuum distilled bar produced at Nuclear Metals Corp; and two passes on one quarter inch diameter Pechiney grade SR extruded bar. Two specimens prepared from zone purified beryllium whose CRSS in tension was between 500 and 600 psi were tested in compression, the first oriented for basal slip and the second oriented for prism slip. CRSS for the former was 1100 psi and for the latter was 6500 psi. No change in the 5: 1 ratio of stress for prism slip to basal slip was observed for this material. A specimen prepared from vacuum distilled beryllium (produced at NMC) with one zone pass was tested in tension. The CRSS for basal glide was 900 psi and the crystal falled at 32% elongation by basal plane cleavage. Several single crystals of zone refined beryllium were hot rolled and subsequently recrystallized. Highly oriented structures were obtained. Crude bend tests were performed on the polycrystalline material. One sample underwent a 60 deg bend producing a 10% strain in the outer fibers. (auth)
- Research Organization:
- Franklin Inst. Labs. for Research and Development, Philadelphia
- NSA Number:
- NSA-15-032545
- OSTI ID:
- 4837550
- Report Number(s):
- NP-10859; P-A2476-5
- Country of Publication:
- United States
- Language:
- English
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