PREPARATION AND EVALUATION OF HIGH PURITY BERYLLIUM. Bi-Monthly Progress Report, May 2 to July 1, 1961

Technical Report · Tue Oct 31 04:00:00 EST 1961

OSTI ID:4842610

Spangler, G E; Arndt, E J; Herman, M

The final assembly of the apparatus for zone melting one-inch diruneter beryllium rods was completed. In the initial trial of this apparatus, a stable zone was established and traversed in a cast bar. Four zone passes were made on this bar, resulting, after the fourth pass, in a single crystal one inch in diameter and four and one-half inches long. The melting of this bar resulted in a demonstration of several additional methods of purification accompanymg vertical zone melting. A comparison of the ductility in the polycrystalline beryllium with about 6% ductility in tension, the same material converted to a single crystal by one zone melting pass, and the multiply zone-refined single crystals which used the polycrystalline beryllium as starting material and exhibited up to 130% over-all elongation was attempted. It was discovered that one zone pass is effective in removing precipitates which appear to limit ductility and thus the one-pass single crystal cannot be compared to the polycrystalline material from which it was formed. The deformation sequence to failure was not identical to the multiply zone-refined crystal showing the greatest ductility and therefore the one-pass ductility result could not be compared to it. Stress-strain curves were plotted to determine the relative impurity effect on the deformation sequence in beryllium. (M.C.G.)

• Research Organization: Franklin Inst. Labs. for Research and Development, Philadelphia
• NSA Number: NSA-15-029629
• OSTI ID: 4842610
• Report Number(s): NP-10696; P-A2476-4
• Country of Publication: United States
• Language: English

Related Subjects

BERYLLIUM
CRYSTALS
DIAGRAMS
DUCTILITY
LIQUID METALS
METALS, CERAMICS, AND OTHER MATERIALS
PREPARATION
RODS
STRAIN
STRESSES
TENSILE PROPERTIES
ZONE MELTING
ZONES