PREPARATION AND EVALUATION OF HIGH PURITY BERYLLIUM. Bi-Monthly Progress Report, September 2-November 1, 1961

Technical Report · Wed Oct 31 04:00:00 EST 1962

OSTI ID:4825852

Spangler, G E; Herman, M; Damiano, V V; Arndt, E J; Hoover, D B

The zone refining of one-inch diameter Brush vacuum cast beryllium bar was continued, along with the zone refining of smaller diameter vacuum distilled and Pechiney SR grade bars. Three single crystal specimens of varying purity content were tested in tension. Vacuum distilled material which was subsequently zone melted seven passes exhibited a value of 400 psi for the critical resolved shear stress on the basal plane. Additional zone melted polycrystalline was prepared by hot rolling and recrystallizing four pass single crystal beryllium. Two different orientations with respect to the rolling plane were used. Tensile tests and bend tests were performed, but the results were inconclusive. Preliminary examinations were made of zone refined beryllium by electron transmission microscopy. It was observed that the dislocations do not move under the influence of the electron beam alone as they were observed to move in other metals. When the specimen was heated to 200 deg C, however. and cycled over a narrow range of temperatures, a slow movement of the dislocations was observed. (auth)

• Research Organization: Franklin Inst. Labs. for Research and Development, Philadelphia Page(s): 14
• NSA Number: NSA-16-004541
• OSTI ID: 4825852
• Report Number(s): NP-11159; P-A2476-6
• Country of Publication: United States
• Language: English

Related Subjects

ANISOTROPY
BERYLLIUM
DEFECTS
DISLOCATIONS
ELECTRON BEAMS
ELECTRON MICROSCOPY
EVAPORATION
HEAT TREATMENTS
HOT WORKING
METALS, CERAMICS, AND OTHER MATERIALS
MONOCRYSTALS
PREPARATION
REFINING
ROLLING
SHEAR
STRESSES
TENSILE PROPERTIES
VACUUM